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EMC VNX and Avamar Deduplication Backup Bring Smooth Sailing to Your Virtualization Odyssey


THE CLIPPER GROUP

Navigator
Published Since 1993                                             Report #TCG2012003LE
                                                                                              TM



                                                                                                   Navigating Information Technology Horizons
                                                                                                                        February 10, 2012
                                                                                                                                                SM




   EMC VNX and Avamar Deduplication Backup
Bring Smooth Sailing to Your Virtualization Odyssey
                                                           Analyst: Michael Fisch

 Management Summary
     In the ancient Greek poem the Odyssey, the hero Odysseus takes ten years to travel by sea to his
 home on Ithaca after the Trojan War. He was held captive by the nymph Calypso on her island and
 later captured by the one-eyed Cyclops. Odysseus encountered numerous adventures along the way,
 such as skirting the treacherous rocks of the mesmerizing Sirens by tying himself to the ship’s mast.
 He finally arrived on Ithaca, slayed the greedy young men courting his wife Penelope, and rejoined his
 household.
     The Odyssey is also a metaphor for the journey of virtualizing your data center. The benefits of the
 journey are worth it, including higher utilization, lower hardware costs, greater flexibility, and ultimate-
 ly higher IT quality of service. The virtualization odyssey takes time and challenges will arise along
 the way, though it does not have to take ten years, nor does it have to involve long struggles with demi-
 gods and monsters. With good planning and smart technologies and processes, enterprises can make
 steady progress in virtualizing a data center, typically in phases, and avoid situations known colloquial-
 ly as “VM stall,” where virtualization progress is slowed or ceased until underlying bottlenecks or other
 problems are resolved.
     EMC has developed a first-rate combination of VNX unified storage and Avamar deduplication
 backup software optimized for supporting VMware virtual environments. VMware is the market-
 leading virtualization software. VNX and Avamar are tightly integrated with VMware at functional
 and management interfaces and deliver a palette of capabilities for addressing virtualization challenges.
 Read on for details about the benefits and challenges of virtualization and how EMC VNX and Avamar
 contribute to fair winds and smooth sailing on your virtualization odyssey.

 Benefits of Virtualization
      Many consider virtualization the greatest thing since sliced bread. And, in a way, virtualization is
 analogous to sliced bread. When a loaf of bread comes pre-sliced, it is easy to use and share. Take one
 slice to make toast, two slices for a sandwich, eight to make French toast for a family breakfast, and so
 on, until the loaf is consumed. Virtualization software “slices” or partitions a physical server into mul-
 tiple virtual machines and enables it to run multiple applications independently. In traditional IT envi-
 ronments, each host server is dedicated to one
 application and compute resources are poorly uti-
 lized – generally around 5 to 10 percent. This is                    IN THIS ISSUE
 like eating only one or two slices from a bread
 loaf and letting the rest go stale. Virtualization       Benefits of Virtualization ....................... 1
 solves this problem through server consolidation         Challenges of Virtualization .................. 2
 and boosts utilization to the range of 60 to 80 per-
                                                          VNX Unified Storage............................... 3
 cent or better. It reduces hardware acquisition
 costs and operating expenses, such as power,             Avamar Deduplication Backup.............. 4

 cooling, floor space, maintenance, and support.          Conclusion .............................................. 7



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February 10, 2012                                                                                                   Page 2

     Moreover, it is amazingly simple to provi-                  workloads are less likely to bump up against sys-
sion a new virtual machine. An administrator                     tem limits. Capacity planning means buying a
can set one up in minutes, as compared to days                   new server or storage capacity when needed, and
or weeks to buy and install a new physical server                having the foresight to do it before applications
in a data center.                                                begin to slow down noticeably or reach a physi-
     Faster provisioning makes IT more respon-                   cal limit. In a virtual environment where multi-
sive to changing business requirements and facil-                ple workloads run per host server, resources are
itates to an agile and more competitive enter-                   operating at closer to maximum and administra-
prise. Virtual machines can migrate between                      tors have to monitor performance issues more
servers, even in real time without disrupting pro-               closely. Capacity planning, in this context,
duction applications. This turns hardware up-                    means correctly sizing resources and adding
grades and workload balancing into easier, non-                  CPU, memory, I/O, storage capacity, or whole
disruptive tasks. The ability to recover a virtual               systems when needed, as well as ensuring a bal-
machine to any hardware platform streamlines                     ance among these components to avoid resource
recoveries. All of this contributes to higher                    bottlenecks that prevent the system from being
availability.                                                    fully utilized. VM migration between servers is
     Virtualization is also a cornerstone of cloud               a valuable feature that facilitates workload bal-
computing, or in less celestial jargon, IT as a                  ancing, system maintenance, and recovery,
Service (ITaaS). Cloud computing is where IT                     though it also means the infrastructure is more
is heading because the concept promises the ul-                  fluid and, thus, more challenging to track and
timate in flexibility, quality of service, and cost              manage. In short, virtual environments are
effectiveness. Private clouds and public clouds                  denser, more dynamic, and operate closer to the
are already being implemented today, and many                    edge of resource limits, which delivers the bene-
more will be as the technology components de-                    fits of virtualization but also requires more strin-
velop and mature. Virtualization is a significant                gent management and controls.
and essential step toward cloud computing.                            Monitoring and management tools and
     At an enterprise data center, the transition to             processes need to be adapted for virtual environ-
a virtual environment typically happens in phas-                 ments. Administrators must be able to monitor
es. It starts with lower-risk applications like test             and troubleshoot on a per-VM basis, which
and development, Web servers, and file and print                 means monitoring performance at the hypervisor
servers, and eventually move to business-critical                layer, as well as operating system, application,
and customer-facing applications. As enterprises                 network, and storage. Tools should be integrat-
try out and develop expertise in server virtualiza-              ed with the virtualization software to ensure vis-
tion and experience the benefits, the footprint                  ibility, coordination, and to leverage its capabili-
expands.                                                         ties fully. As the environment grows, alerts and
                                                                 automation help greatly to keep up with man-
Challenges of Virtualization                                     agement tasks.
     Virtualization brings a different set of chal-                   VM sprawl is a well-known problem in vir-
lenges than a purely physical environment. Vir-                  tualized environments. It is so easy to create
tualization adds a software abstraction layer on                 new VMs – a matter of a few keystrokes and
top of server hardware that partitions the system                mouse clicks – that there is an inclination to cre-
and enables it to support multiple instances of                  ate too many and overload system resources.
operating systems and applications. This change                  Each VM consumes CPU, memory, I/O, and
is significant and structural and requires a corre-              storage. It is not free. However, compared to
sponding change in IT management processes                       the long and deliberate process of requisitioning,
and tools. Key areas to address include capacity                 purchasing, and installing a new physical server,
planning, resource monitoring and management,                    it easy to overlook the real cost of provisioning
VM sprawl, I/O bottlenecks, storage manage-                      VMs and allow them to proliferate uncontrolled.
ment, data protection, and backup.                               The solution is to establish a formal request and
     Capacity planning in a virtual environment                  approval process, limit access, and decommis-
is more challenging because the infrastructure is                sion VMs that are no longer needed and return
shared and utilization rates are higher. In a tradi-             their freed resources to the available pool. VM
tional environment where each server hosts a                     sprawl also accentuates the needs for good capa-
single application, resource utilization is low and              city planning and resource monitoring.

Copyright © 2012 by The Clipper Group, Inc. Reproduction prohibited without advance written permission. All rights reserved.
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February 10, 2012                                                                                                   Page 3

     I/O Bottlenecks, in particular, are common                  cesses, and skills for managing a virtual envi-
resource constraints in virtual environments.                    ronment.
With multiple workloads sharing the same net-                         But why get stuck on an island and delay the
work or host bus adapters, network links and                     full benefits of virtualization? And why spend
storage systems, traffic can become congested                    more time and money to address these challeng-
and slow down application performance. Man-                      es after the fact? We recommend tackling the
agement features like VM migrations and even                     challenges of virtualization beforehand to facili-
VM snapshots put more traffic on I/O channels.                   tate smooth sailing on your virtualization odys-
So, it is important to size I/O correctly and regu-              sey.
larly monitor I/O performance to identify and
remedy bottlenecks.                                              VNX Unified Storage
     Storage management is critical because it                        The EMC VNX series unified storage1 plat-
has a significant impact on performance and cost                 form has a feature set well-suited for virtual en-
in a virtual environment. As the end of the I/O                  vironments, including unified SAN and NAS,
stream and the only part of the system with                      redundancy, scalability, high performance, re-
physically moving parts (i.e., disk drives), stor-               source efficiency, simplified management, and
age performance directly affects application                     support for VMware and Microsoft Hyper-V.
workloads. Maintaining sufficient capacity in                    The VNX series includes multiple products
the wake of VM sprawl, snapshots, and natural                    spanning the midrange: VNX5100, VNX5300,
data growth is essential to avoid incapacitating                 VNX5500, VNX5700, and VNX7500.
out-of-space conditions. Finally, storage is a                        VNX supports SAN and NAS, also known
dear resource and the efficient use of storage is                as “block” and “file” storage, which gives users
consequential to the total infrastructure cost of a              choice among FC, iSCSI, FCoE, CIFS, and NFS
virtual environment.                                             for their virtual environments. Networked stor-
     The rules of data protection and backup                     age is a best practice for virtualization because it
and recovery change in a virtual environment                     can be shared among multiple servers. It enables
because of workload density and the added hy-                    storage consolidation and advanced capabilities,
pervisor layer. With multiple application work-                  such as VMware vMotion, for online VM migra-
loads running on a physical server, there are less               tion between ESXi servers. Most enterprises
CPU, memory, and I/O resources available for                     choose SAN storage for best performance in a
replication, copies, and backup. Backup, in par-                 virtual environment, though some opt for NAS
ticular, presents a challenge. With multiple                     for its manageability benefits. The VNX can
workloads to back up within a limited time win-                  serve virtual and physical infrastructure in the
dow, this process can overrun the backup win-                    same system, as most enterprises will continue to
dow and slow production activities during busi-                  have a hybrid storage environment in its data
ness hours or cause some data to be unprotected.                 centers.
Above-average data growth in virtual environ-                         The VNX architecture has built-in redun-
ments compounds this problem. Since VMs can                      dancy with no single points of failure. In fact,
move between physical servers, it is more chal-                  EMC claims “five 9s” availability based on ac-
lenging to track the backup status of workloads                  tual field performance. As virtual environments
and ensure backup service levels are met. There                  consolidate more workloads and application data
is also the question of whether to run agents at                 sets into fewer systems, high availability be-
the guest (i.e., application and OS) or image (i.e.,             comes more important for maintaining applica-
VM encapsulated file) level, where each has its                  tion uptime and business continuity. VNX fea-
advantages.                                                      tures include dual active/active controllers, au-
     If the challenges of virtualization are not ad-             tomatic failover and failback, mirrored write
dressed strategically and effectively, they can                  cache with de-stage to disk in the event of power
lead to a situation known as VM stall. Like                      failure, RAID 0, 1, 0/1, 3, 5, and 6. The system
Odysseus’ seven-year captivity on Calypso’s                      supports internal monitoring, call-home, remote
island, this is where the progress of virtualizing a             diagnostics, and non-disruptive software up-
data center slows or ceases until the underlying
problems are resolved. VM stall is not inevita-                  1
                                                                   See The Clipper Group Navigator dated February 21,
ble; rather, it is the result of insufficient planning           2011, entitled New EMC VNX Unified Storage Family Offers
and investment in the optimal technologies, pro-                 the Best of CLARiiON and Celerra for the Midrange and
                                                                 available at http://www.clipper.com/research/TCG2011008.pdf.

Copyright © 2012 by The Clipper Group, Inc. Reproduction prohibited without advance written permission. All rights reserved.
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February 10, 2012                                                                                                   Page 4

grades and field hardware replacement.                           find that by using storage tiers with a mix of
    The VNX architecture is also modular and                     flash and disk drives, they can optimize perfor-
scalable. Virtual environments drive storage                     mance while lowering drive costs. File dedupli-
growth at an above average pace, so storage                      cation and compression reduces space consumed
scalability is essential for maintaining adequate                in NAS environments, while block compression
capacity. The VNX expands incrementally by                       reduces space for inactive LUNs in SAN envi-
adding Disk Array Enclosures (DAE) and disk                      ronments. (There’s more on deduplication in the
drives (small form-factor SAS; large form-factor                 next section on Avamar.)
SAS, NL-SAS, and flash (SSD2)). The largest                           Storage administrators need to have visibil-
VNX7500 expands to a maximum capacity of up                      ity into the virtual environment, and VMware
to 1,000 drives (or 1,974TBs with 2TB drives),                   administrators should have some control over
reaching well into the high-end range of the stor-               storage resources. EMC Unisphere is the cen-
age market.                                                      tralized management console for VNX systems,
    Virtual environments are more sensitive to                   as well as EMC’s CLARiiON, Celerra, and Re-
storage performance because they concentrate                     coverPoint/SE.      Unisphere is virtualization-
multiple workloads onto a shared I/O path. Mix-                  aware and provides a view extending into
ing operations from multiple workloads also                      VMware vSphere. It automatically discovers
turns disk-friendly sequential operations into                   ESXi Servers and VMs and maps them to physi-
cache-centric random operations. Storage arrays                  cal volumes on an EMC storage array. Virtual
need to deliver solid performance, especially for                Storage Integrator, a vSphere Client plug-in for
random I/Os, to maintain acceptable application                  Unisphere, allows VMware administrators to
performance.                                                     discover and identify VNX storage devices, pro-
    VNX optimizes performance with a “Flash                      vision and mount new data stores, and manage
1st” strategy that includes features like FAST VP                multipathing with EMC PowerPath. Unisphere
(Fully Automated Storage Tiering for Virtual                     Analyzer is an optional feature for monitoring
Pools) and FAST Cache. Beyond standard cache                     and analyzing storage performance and is useful
memory, VNX supports FAST Cache, which                           for spotting and managing I/O bottlenecks. All
allocates up to 2 TB of flash drive capacity as                  of these tools help address the challenge of mon-
read-write cache, which gives a major boost to                   itoring and management of storage resources in a
random I/O performance. The feature monitors                     virtual environment.
I/O activity and automatically moves frequently                       Furthermore, VNX is integrated with the
accessed data in 64KB blocks into flash-based                    vStorage API for Array Integration (VAAI). This
cache to deliver a faster system response time.                  is a set of APIs that allows VMware ESXi hosts
FAST VP provides automated storage tiering.                      to coordinate with storage arrays and offload
This feature analyzes I/O patterns, categorizes                  I/O-intensive operations, such as copies and
them based on access frequency, and automati-                    writing zeroes. For thin provisioning, it assists
cally moves 1GB increments between tiers of                      with dead space reclamation and limits the im-
SAS, NL-SAS, and flash drives to optimize per-                   pact of an out-of-space condition to the related
formance and resource efficiency. FAST VP                        VM, instead of all VMs in the data store. These
and FAST Cache can be used simultaneously,                       capabilities help make the most of storage and
though each requires dedicated flash drives.                     I/O resources and keep costs down. VNX sup-
VNX also offers high-speed 8Gb per second FC                     ports also VMware Site Recovery Manager
and 10GbE connections for host connectivity.                     (SRM), a plug-in for vCenter that automates fail-
    Resource efficiency features are designed to                 over and failback between sites and makes disas-
reduce actual capacity requirements and cost in                  ter recovery faster and more reliable. The VNX
the VNX. Virtual provisioning is a thin provi-                   replication software MirrorView can then partic-
sioning feature that presents a large virtual ca-                ipate in the automated recovery process, facilitat-
pacity to the host while allocating actual capacity              ing data protection in a virtual environment.
incrementally from a shared pool as it is con-                   Avamar Deduplication Backup Soft-
sumed. It also supports fully-allocated thick
provisioning for maximum performance. FAST
                                                                 ware and System
VP is another efficiency tool. Many enterprises                    EMC Avamar3 is uniquely suited for virtual

                                                                 3
2                                                                  See The Clipper Group Navigator dated June 8, 2010,
    SSD=Solid State Disk.                                        entitled EMC NetWorker and Avamar — An Integrated Pair

Copyright © 2012 by The Clipper Group, Inc. Reproduction prohibited without advance written permission. All rights reserved.
The Clipper Group Navigator
                                                                                    TM
February 10, 2012                                                                                                    Page 5

environments and offers deep integration with                    desktop and laptop PCs over a WAN connection
VMware. It solves several virtualization chal-                   to an enterprise’s main data center, thereby con-
lenges related to backup and recovery.                           solidating the backup process.
     Very fast daily full backups through                            Deduplicating data in this way minimizes
       variable-length client-side and global                    the impact of backup on virtualized servers, so
       deduplication, backup to disk, and                        backups are faster and more reliable and enter-
       VMware integration.                                       prises can maintain high utilization rates on vir-
     Fast, one-step recovery through daily                      tualized servers without being constrained by the
       “full” backup and changed-block re-                       backup process. Avamar does a full backup ini-
       store through VMware integration.                         tially as a baseline and all subsequent backups
     Virtualization-aware backup moni-                          are incremental. It organizes data so that each
       toring and management through in-                         incremental is presentable as a logical full back-
       tegration with VMware vCenter.                            up and restores are a one-step process. This
     Guest, image, and off-host backup                          eliminates the tedious process of restoring the
                                                                 last “good full” and subsequent “incrementals”
       through applications and VMware in-
                                                                 to reach the desired recovery point.
       tegrations.
     Dramatically reduces backup storage                             Disk-based backup has become mainstream
                                                                 because of its speed and reliability advantages
       capacity requirement and cost
                                                                 over tape. Tape may be too slow or unreliable to
       through variable-length deduplication.
                                                                 meet the data protection requirements of the
     Virtual Avamar server option via                           business.4 It requires physical handling and can
       Avamar Virtual Edition virtual ap-                        be misplaced or damaged during loading, un-
       pliance, which leverages an existing                      loading, or transport. In contrast, disk is a faster
       VMware ESX server’s disk, storage,                        storage medium, especially because it can pro-
       CPU, and memory.                                          cess random reads and writes immediately. It
     Backup of physical and virtual envi-                       does not require handling and is resilient through
       ronments because most enterprises                         RAID and redundant components. Disk-based
       will continue to have both.                               storage can be checked daily for data integrity –
Client-Side Deduplication Backup                                 something that is not done with tape. Moreover,
    Avamar reduces backup data at the client be-                 data deduplication solutions, like Avamar, make
fore transferring it across a network for storage                disk-based backup feasible by effectively shat-
on disk. It uses a variable-length, sub-file dedu-               tering the cost barrier.
plication algorithm to minimize the amount of                    Backup Across the Enterprise
data being transported and, therefore, also mini-                     In addition to virtual environments, Avamar
mizes network bandwidth and storage require-                     is particularly effective for remote and branch
ments. Through a sophisticated identification                    office consolidated backup, desktops and lap-
and communication process, Avamar eliminates                     tops, file servers, and NAS systems.
redundant backup data within and across pro-                          Avamar’s client-side deduplication enables
tected systems, wherever they exist in the enter-                fast, daily full backups for remote office servers
prise. According to EMC, Avamar reduces the                      and desktop/laptop systems via existing WAN
required daily network bandwidth consumption                     links. Avamar automatically backs up systems
by up to 99% and cumulative backend storage                      to an enterprise’s main data center, thereby con-
can be reduced by up to 50 times (depending on                   solidating the backup process. Backup and re-
the nature of the data) across sites and servers.                covery becomes more manageable and reliable
    Avamar supports client-side deduplication of                 by leveraging the data center IT experts and
databases related to applications, such as Mi-                   eliminating reliance on non-technical remote
crosoft Exchange, SQL, and SharePoint, Oracle,                   workers and failure-prone local tape devices.
IBM’s DB2 and Lotus Domino, and others.                          Avamar also offers an easy-to-use interface that
Avamar is tightly integrated with VMware for                     enables desktop/laptop users to recover their
backing up virtual machines. Avamar automati-                    own data quickly without involving the IT help
cally backs up servers in remote offices and even
                                                                 4
                                                                   However, tape is still the lowest-cost option for long-term
for Traditional and Deduplication Backup and available at        data archiving. Avamar can export deduplicated backup data
http://www.clipper.com/research/TCG2010028.pdf.                  to tape for long-term preservation.

Copyright © 2012 by The Clipper Group, Inc. Reproduction prohibited without advance written permission. All rights reserved.
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February 10, 2012                                                                                                   Page 6

desk, which boosts user productivity and frees IT                   environments is available, as well. The disad-
staff to work on other projects.                                    vantage of guest-level backup is, with multiple
     For NAS systems, the Avamar NDMP Ac-                           agents running simultaneously during the
celerator provides fast, daily full backups and                     backup window; the agents compete for re-
eliminates the need for recurring level-0                           sources and can overload the system, limiting
“dumps” that often exceed the available backup                      physical server consolidation.         However,
time window for completion. By eliminating                          while Avamar agents typically use 15% more
this backup bottleneck, Avamar facilitates great-                   CPU than traditional backup agents, Avamar
er NAS utilization and performance without lim-                     backups complete up to 10 times faster, reduc-
iting the amount or size of files on the NAS de-                    ing the total client CPU utilization by up to
vice.                                                               85% over a seven-day period compared to tra-
     Avamar also supports disaster recovery,                        ditional methods and making daily full guest
since deduplicated backup data can be efficiently                   backups faster and more efficient.
replicated to an offsite location via existing                    Image-level backup leverages the VMware
WAN links.                                                          vStorage APIs for Data Protection (VADP)
     While many enterprises will retain tradition-                  for off-host backup of VMDK (virtual ma-
al backup applications for some environments, if                    chine disk) files that encapsulate the entire vir-
only because their backup processes are so well                     tual server, including VM configuration, oper-
entrenched, Avamar can serve as the backup ap-                      ating system, and application. Backup agents
plication for an entire data center or distributed                  are not required to run in each VM, as the case
enterprise – both physical and virtual environ-                     with guest-level backup. Rather, the ESXi
ments.                                                              Server takes a snapshot copy of each VM and
                                                                    presents it to a proxy server running Avamar
VMware Integration                                                  agents (the proxy itself is a VM). Backup jobs
     Avamar is integrated with VMware vCenter                       flow directly over the network from the stor-
Server. The Avamar management console ac-                           age array through the proxy to an Avamar Da-
cesses vCenter Server directly, discovers new                       ta Store. The VNX also supports vProxy
VMs automatically, and displays their current                       Server Load Balancing that automatically dis-
backup status, whether guest or image backup or                     tributes backup jobs round robin among mul-
unprotected. Administrators have instant visibil-                   tiple proxy servers, to speed up the backup
ity to apply the appropriate backup policies.                       process and make the most of available re-
This capability is very helpful for backup man-                     sources. The image-level approach facilitates
agement in a world of VM sprawl and migrating                       faster backups, is non-disruptive to production
VMs. For example, if a server administrator                         applications, and allows VMware to consoli-
creates a new VM in response to a user request,                     date more workloads per physical server. Re-
the backup administrator can automatically dis-                     coveries can be full VMDK files or individual
cover it and apply a backup policy. With this                       files (but only for Windows).
baseline protection in place, he can inquire with                     Related to image backup is a VMware fea-
the server administrator about the level of data                 ture called Changed Block Tracking that time-
protection it should have going forward.                         stamps changes to block data in VMDK files and
     Avamar supports both guest- and image-                      makes this information available through VADP.
level backups for VMware environments.                           Avamar leverages Changed Block Tracking to
 Guest-level backup is similar to traditional                   further speed backup and recovery times.
   backup for physical servers. It uses the same                 Avamar identifies the blocks that changed from
   backup agents, except agents run in the VMs                   last backup to the current state of the VM, and
   on an ESXi server. If 20 VM workloads are                     restore only those blocks – speeding restores to
   running on a physical server, 20 backup                       the production environment by 30 times, com-
   agents also are running. Guest-level backup is                pared to traditional restores, according to EMC.
   the most familiar to traditional backup admin-                     When choosing between guest-level and im-
   istrators and offers a sense of continuity in                 age-level backup for your workloads, image-
   transitioning to a virtual environment. Appli-                level is preferable because it is non-disruptive,
   cation consistency is available for guest-level               offers greater resource efficiency, more address-
   backups using agents that integrate with spe-                 es more virtualization challenges, but there are
   cific applications like SQL or Oracle. File-                  limitations, such as application consistency,
   level restore for Windows, Linux, and Solaris                 where in-guest is the viable alternative.

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February 10, 2012                                                                                                   Page 7

Virtual Avamar Servers
    The EMC Avamar Virtual Edition for VM-
ware is a virtual appliance for backup, recovery,
and disaster recovery. Avamar Virtual Edition
enables users to deploy Avamar deduplication
technology in an easy and repeatable fashion on
VMware ESXi Server hosts. Each virtual appli-
ance supports up to 2TBs of deduplicated back-
up capacity (which under a typical traditional
backup schedule would require approximately
70TBs of tape or disk storage) and leverages the
existing VMware shared server and storage in-
frastructure to minimize costs and simplify man-
agement. Avamar Virtual Edition supports
vMotion for deployment flexibility and up to
two virtual appliances per ESXi server. By sup-
porting replication between Avamar virtual ap-
pliances or from Avamar virtual appliances to
physical Avamar servers (discussed next), it
provides an alternative for offsite tape shipments
and eliminates the risk of losing unencrypted
data.
    EMC also offers physical Avamar Data
Store servers packaged as an all-in-one solution
consisting of EMC Avamar software running on
preconfigured, EMC-certified hardware. The
Avamar Data Store is available in a scalable
multi-node model or a single-node model. The
advantages of a packaged solution include
streamlined purchasing, deployment, and on-site
setup.
Conclusion
     The cost, flexibility, and business agility
benefits of virtualization far outweigh its chal-
lenges. With thoughtful planning and the right
technologies, you can enjoy smooth sailing on
your virtualization odyssey and avoid getting
caught up on the rocks of VM stall. So, take a
close look at EMC VNX unified storage and
Avamar deduplication backup software and sys-
tem for your virtual environment. They are
more than storage and backup elements for your
infrastructure; they can also bring features and
integration with VMware that solve your virtual-
ization challenges. Avamar is
also a great solution for back-
up, recovery, and disaster re-
covery of data residing in re-
mote/branch offices, desk-
tops/laptops, and NAS sys-
tems. Together this combina-
tion can transform your infra-
structure and accelerate your
virtualization odyssey.                                 SM




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February 10, 2012                                                                                                   Page 8


                                  About The Clipper Group, Inc.
    The Clipper Group, Inc., now in its twentieth year, is an independent consulting firm spe-
    cializing in acquisition decisions and strategic advice regarding complex, enterprise-class in-
    formation technologies. Our team of industry professionals averages more than 25 years of
    real-world experience. A team of staff consultants augments our capabilities, with significant
    experience across a broad spectrum of applications and environments.
     The Clipper Group can be reached at 781-235-0085 and found on the web at
         www.clipper.com.

                                         About the Author
    Michael Fisch is a Senior Contributing Analyst for The Clipper Group. He brings 15
    years of experience in the computer industry working in marketing, sales, and engineering, the
    last nine of which he has been an analyst with Clipper. Before Clipper, Mr. Fisch worked at
    EMC Corporation as a marketing program manager focused on service providers and as a
    competitive market analyst. Before that, he worked in international channel development,
    manufacturing, and technical support at Extended Systems (since acquired by Sybase).
    Mr. Fisch earned an MBA from Babson College and a Bachelor’s degree in electrical engineer-
    ing from the University of Idaho.
     Reach Michael Fisch via e-mail at mike.fisch@clipper.com at 781-235-0085 Ext. 211.
         (Please dial “211” when you hear the automated attendant.).

                          Regarding Trademarks and Service Marks
                                     ,                                   ,
           ,                                   ,                                             , and
    “clipper.com” are trademarks of The Clipper Group, Inc., and the clipper ship drawings, “Nav-
    igating Information Technology Horizons”, and “teraproductivity” are service marks of The
    Clipper Group, Inc. The Clipper Group, Inc., reserves all rights regarding its trademarks and
    service marks. All other trademarks, etc., belong to their respective owners.

                                               Disclosure
    Officers and/or employees of The Clipper Group may own as individuals, directly or indirectly,
    shares in one or more companies discussed in this bulletin. Company policy prohibits any of-
    ficer or employee from holding more than one percent of the outstanding shares of any compa-
    ny covered by The Clipper Group. The Clipper Group, Inc., has no such equity holdings.
    After publication of a bulletin on clipper.com, The Clipper Group offers all vendors and users
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    ing of Clipper documents on other’s websites, and printing of hard-copy reprints is not allowed
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                              Regarding the Information in this Issue
 The Clipper Group believes the information included in this report to be accurate. Data has been
 received from a variety of sources, which we believe to be reliable, including manufacturers, dis-
 tributors, or users of the products discussed herein. The Clipper Group, Inc., cannot be held respon-
 sible for any consequential damages resulting from the application of information or opinions con-
 tained in this report.



Copyright © 2012 by The Clipper Group, Inc. Reproduction prohibited without advance written permission. All rights reserved.

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Analyst Report : EMC VNX and Avamar Deduplication Backup Bring Smooth Sailing to Your Virtualization Odyssey

  • 1. EMC VNX and Avamar Deduplication Backup Bring Smooth Sailing to Your Virtualization Odyssey THE CLIPPER GROUP Navigator Published Since 1993 Report #TCG2012003LE TM Navigating Information Technology Horizons February 10, 2012 SM EMC VNX and Avamar Deduplication Backup Bring Smooth Sailing to Your Virtualization Odyssey Analyst: Michael Fisch Management Summary In the ancient Greek poem the Odyssey, the hero Odysseus takes ten years to travel by sea to his home on Ithaca after the Trojan War. He was held captive by the nymph Calypso on her island and later captured by the one-eyed Cyclops. Odysseus encountered numerous adventures along the way, such as skirting the treacherous rocks of the mesmerizing Sirens by tying himself to the ship’s mast. He finally arrived on Ithaca, slayed the greedy young men courting his wife Penelope, and rejoined his household. The Odyssey is also a metaphor for the journey of virtualizing your data center. The benefits of the journey are worth it, including higher utilization, lower hardware costs, greater flexibility, and ultimate- ly higher IT quality of service. The virtualization odyssey takes time and challenges will arise along the way, though it does not have to take ten years, nor does it have to involve long struggles with demi- gods and monsters. With good planning and smart technologies and processes, enterprises can make steady progress in virtualizing a data center, typically in phases, and avoid situations known colloquial- ly as “VM stall,” where virtualization progress is slowed or ceased until underlying bottlenecks or other problems are resolved. EMC has developed a first-rate combination of VNX unified storage and Avamar deduplication backup software optimized for supporting VMware virtual environments. VMware is the market- leading virtualization software. VNX and Avamar are tightly integrated with VMware at functional and management interfaces and deliver a palette of capabilities for addressing virtualization challenges. Read on for details about the benefits and challenges of virtualization and how EMC VNX and Avamar contribute to fair winds and smooth sailing on your virtualization odyssey. Benefits of Virtualization Many consider virtualization the greatest thing since sliced bread. And, in a way, virtualization is analogous to sliced bread. When a loaf of bread comes pre-sliced, it is easy to use and share. Take one slice to make toast, two slices for a sandwich, eight to make French toast for a family breakfast, and so on, until the loaf is consumed. Virtualization software “slices” or partitions a physical server into mul- tiple virtual machines and enables it to run multiple applications independently. In traditional IT envi- ronments, each host server is dedicated to one application and compute resources are poorly uti- lized – generally around 5 to 10 percent. This is IN THIS ISSUE like eating only one or two slices from a bread loaf and letting the rest go stale. Virtualization  Benefits of Virtualization ....................... 1 solves this problem through server consolidation  Challenges of Virtualization .................. 2 and boosts utilization to the range of 60 to 80 per-  VNX Unified Storage............................... 3 cent or better. It reduces hardware acquisition costs and operating expenses, such as power,  Avamar Deduplication Backup.............. 4 cooling, floor space, maintenance, and support.  Conclusion .............................................. 7 The Clipper Group, Inc. - Technology Acquisition Consultants Internet Publisher  One Forest Green Road  Rye, New Hampshire 03870  U.S.A.  781-235-0085  781-235-5454 FAX Visit Clipper at www.clipper.com  Send comments to editor@clipper.com
  • 2. The Clipper Group Navigator TM February 10, 2012 Page 2 Moreover, it is amazingly simple to provi- workloads are less likely to bump up against sys- sion a new virtual machine. An administrator tem limits. Capacity planning means buying a can set one up in minutes, as compared to days new server or storage capacity when needed, and or weeks to buy and install a new physical server having the foresight to do it before applications in a data center. begin to slow down noticeably or reach a physi- Faster provisioning makes IT more respon- cal limit. In a virtual environment where multi- sive to changing business requirements and facil- ple workloads run per host server, resources are itates to an agile and more competitive enter- operating at closer to maximum and administra- prise. Virtual machines can migrate between tors have to monitor performance issues more servers, even in real time without disrupting pro- closely. Capacity planning, in this context, duction applications. This turns hardware up- means correctly sizing resources and adding grades and workload balancing into easier, non- CPU, memory, I/O, storage capacity, or whole disruptive tasks. The ability to recover a virtual systems when needed, as well as ensuring a bal- machine to any hardware platform streamlines ance among these components to avoid resource recoveries. All of this contributes to higher bottlenecks that prevent the system from being availability. fully utilized. VM migration between servers is Virtualization is also a cornerstone of cloud a valuable feature that facilitates workload bal- computing, or in less celestial jargon, IT as a ancing, system maintenance, and recovery, Service (ITaaS). Cloud computing is where IT though it also means the infrastructure is more is heading because the concept promises the ul- fluid and, thus, more challenging to track and timate in flexibility, quality of service, and cost manage. In short, virtual environments are effectiveness. Private clouds and public clouds denser, more dynamic, and operate closer to the are already being implemented today, and many edge of resource limits, which delivers the bene- more will be as the technology components de- fits of virtualization but also requires more strin- velop and mature. Virtualization is a significant gent management and controls. and essential step toward cloud computing. Monitoring and management tools and At an enterprise data center, the transition to processes need to be adapted for virtual environ- a virtual environment typically happens in phas- ments. Administrators must be able to monitor es. It starts with lower-risk applications like test and troubleshoot on a per-VM basis, which and development, Web servers, and file and print means monitoring performance at the hypervisor servers, and eventually move to business-critical layer, as well as operating system, application, and customer-facing applications. As enterprises network, and storage. Tools should be integrat- try out and develop expertise in server virtualiza- ed with the virtualization software to ensure vis- tion and experience the benefits, the footprint ibility, coordination, and to leverage its capabili- expands. ties fully. As the environment grows, alerts and automation help greatly to keep up with man- Challenges of Virtualization agement tasks. Virtualization brings a different set of chal- VM sprawl is a well-known problem in vir- lenges than a purely physical environment. Vir- tualized environments. It is so easy to create tualization adds a software abstraction layer on new VMs – a matter of a few keystrokes and top of server hardware that partitions the system mouse clicks – that there is an inclination to cre- and enables it to support multiple instances of ate too many and overload system resources. operating systems and applications. This change Each VM consumes CPU, memory, I/O, and is significant and structural and requires a corre- storage. It is not free. However, compared to sponding change in IT management processes the long and deliberate process of requisitioning, and tools. Key areas to address include capacity purchasing, and installing a new physical server, planning, resource monitoring and management, it easy to overlook the real cost of provisioning VM sprawl, I/O bottlenecks, storage manage- VMs and allow them to proliferate uncontrolled. ment, data protection, and backup. The solution is to establish a formal request and Capacity planning in a virtual environment approval process, limit access, and decommis- is more challenging because the infrastructure is sion VMs that are no longer needed and return shared and utilization rates are higher. In a tradi- their freed resources to the available pool. VM tional environment where each server hosts a sprawl also accentuates the needs for good capa- single application, resource utilization is low and city planning and resource monitoring. Copyright © 2012 by The Clipper Group, Inc. Reproduction prohibited without advance written permission. All rights reserved.
  • 3. The Clipper Group Navigator TM February 10, 2012 Page 3 I/O Bottlenecks, in particular, are common cesses, and skills for managing a virtual envi- resource constraints in virtual environments. ronment. With multiple workloads sharing the same net- But why get stuck on an island and delay the work or host bus adapters, network links and full benefits of virtualization? And why spend storage systems, traffic can become congested more time and money to address these challeng- and slow down application performance. Man- es after the fact? We recommend tackling the agement features like VM migrations and even challenges of virtualization beforehand to facili- VM snapshots put more traffic on I/O channels. tate smooth sailing on your virtualization odys- So, it is important to size I/O correctly and regu- sey. larly monitor I/O performance to identify and remedy bottlenecks. VNX Unified Storage Storage management is critical because it The EMC VNX series unified storage1 plat- has a significant impact on performance and cost form has a feature set well-suited for virtual en- in a virtual environment. As the end of the I/O vironments, including unified SAN and NAS, stream and the only part of the system with redundancy, scalability, high performance, re- physically moving parts (i.e., disk drives), stor- source efficiency, simplified management, and age performance directly affects application support for VMware and Microsoft Hyper-V. workloads. Maintaining sufficient capacity in The VNX series includes multiple products the wake of VM sprawl, snapshots, and natural spanning the midrange: VNX5100, VNX5300, data growth is essential to avoid incapacitating VNX5500, VNX5700, and VNX7500. out-of-space conditions. Finally, storage is a VNX supports SAN and NAS, also known dear resource and the efficient use of storage is as “block” and “file” storage, which gives users consequential to the total infrastructure cost of a choice among FC, iSCSI, FCoE, CIFS, and NFS virtual environment. for their virtual environments. Networked stor- The rules of data protection and backup age is a best practice for virtualization because it and recovery change in a virtual environment can be shared among multiple servers. It enables because of workload density and the added hy- storage consolidation and advanced capabilities, pervisor layer. With multiple application work- such as VMware vMotion, for online VM migra- loads running on a physical server, there are less tion between ESXi servers. Most enterprises CPU, memory, and I/O resources available for choose SAN storage for best performance in a replication, copies, and backup. Backup, in par- virtual environment, though some opt for NAS ticular, presents a challenge. With multiple for its manageability benefits. The VNX can workloads to back up within a limited time win- serve virtual and physical infrastructure in the dow, this process can overrun the backup win- same system, as most enterprises will continue to dow and slow production activities during busi- have a hybrid storage environment in its data ness hours or cause some data to be unprotected. centers. Above-average data growth in virtual environ- The VNX architecture has built-in redun- ments compounds this problem. Since VMs can dancy with no single points of failure. In fact, move between physical servers, it is more chal- EMC claims “five 9s” availability based on ac- lenging to track the backup status of workloads tual field performance. As virtual environments and ensure backup service levels are met. There consolidate more workloads and application data is also the question of whether to run agents at sets into fewer systems, high availability be- the guest (i.e., application and OS) or image (i.e., comes more important for maintaining applica- VM encapsulated file) level, where each has its tion uptime and business continuity. VNX fea- advantages. tures include dual active/active controllers, au- If the challenges of virtualization are not ad- tomatic failover and failback, mirrored write dressed strategically and effectively, they can cache with de-stage to disk in the event of power lead to a situation known as VM stall. Like failure, RAID 0, 1, 0/1, 3, 5, and 6. The system Odysseus’ seven-year captivity on Calypso’s supports internal monitoring, call-home, remote island, this is where the progress of virtualizing a diagnostics, and non-disruptive software up- data center slows or ceases until the underlying problems are resolved. VM stall is not inevita- 1 See The Clipper Group Navigator dated February 21, ble; rather, it is the result of insufficient planning 2011, entitled New EMC VNX Unified Storage Family Offers and investment in the optimal technologies, pro- the Best of CLARiiON and Celerra for the Midrange and available at http://www.clipper.com/research/TCG2011008.pdf. Copyright © 2012 by The Clipper Group, Inc. Reproduction prohibited without advance written permission. All rights reserved.
  • 4. The Clipper Group Navigator TM February 10, 2012 Page 4 grades and field hardware replacement. find that by using storage tiers with a mix of The VNX architecture is also modular and flash and disk drives, they can optimize perfor- scalable. Virtual environments drive storage mance while lowering drive costs. File dedupli- growth at an above average pace, so storage cation and compression reduces space consumed scalability is essential for maintaining adequate in NAS environments, while block compression capacity. The VNX expands incrementally by reduces space for inactive LUNs in SAN envi- adding Disk Array Enclosures (DAE) and disk ronments. (There’s more on deduplication in the drives (small form-factor SAS; large form-factor next section on Avamar.) SAS, NL-SAS, and flash (SSD2)). The largest Storage administrators need to have visibil- VNX7500 expands to a maximum capacity of up ity into the virtual environment, and VMware to 1,000 drives (or 1,974TBs with 2TB drives), administrators should have some control over reaching well into the high-end range of the stor- storage resources. EMC Unisphere is the cen- age market. tralized management console for VNX systems, Virtual environments are more sensitive to as well as EMC’s CLARiiON, Celerra, and Re- storage performance because they concentrate coverPoint/SE. Unisphere is virtualization- multiple workloads onto a shared I/O path. Mix- aware and provides a view extending into ing operations from multiple workloads also VMware vSphere. It automatically discovers turns disk-friendly sequential operations into ESXi Servers and VMs and maps them to physi- cache-centric random operations. Storage arrays cal volumes on an EMC storage array. Virtual need to deliver solid performance, especially for Storage Integrator, a vSphere Client plug-in for random I/Os, to maintain acceptable application Unisphere, allows VMware administrators to performance. discover and identify VNX storage devices, pro- VNX optimizes performance with a “Flash vision and mount new data stores, and manage 1st” strategy that includes features like FAST VP multipathing with EMC PowerPath. Unisphere (Fully Automated Storage Tiering for Virtual Analyzer is an optional feature for monitoring Pools) and FAST Cache. Beyond standard cache and analyzing storage performance and is useful memory, VNX supports FAST Cache, which for spotting and managing I/O bottlenecks. All allocates up to 2 TB of flash drive capacity as of these tools help address the challenge of mon- read-write cache, which gives a major boost to itoring and management of storage resources in a random I/O performance. The feature monitors virtual environment. I/O activity and automatically moves frequently Furthermore, VNX is integrated with the accessed data in 64KB blocks into flash-based vStorage API for Array Integration (VAAI). This cache to deliver a faster system response time. is a set of APIs that allows VMware ESXi hosts FAST VP provides automated storage tiering. to coordinate with storage arrays and offload This feature analyzes I/O patterns, categorizes I/O-intensive operations, such as copies and them based on access frequency, and automati- writing zeroes. For thin provisioning, it assists cally moves 1GB increments between tiers of with dead space reclamation and limits the im- SAS, NL-SAS, and flash drives to optimize per- pact of an out-of-space condition to the related formance and resource efficiency. FAST VP VM, instead of all VMs in the data store. These and FAST Cache can be used simultaneously, capabilities help make the most of storage and though each requires dedicated flash drives. I/O resources and keep costs down. VNX sup- VNX also offers high-speed 8Gb per second FC ports also VMware Site Recovery Manager and 10GbE connections for host connectivity. (SRM), a plug-in for vCenter that automates fail- Resource efficiency features are designed to over and failback between sites and makes disas- reduce actual capacity requirements and cost in ter recovery faster and more reliable. The VNX the VNX. Virtual provisioning is a thin provi- replication software MirrorView can then partic- sioning feature that presents a large virtual ca- ipate in the automated recovery process, facilitat- pacity to the host while allocating actual capacity ing data protection in a virtual environment. incrementally from a shared pool as it is con- Avamar Deduplication Backup Soft- sumed. It also supports fully-allocated thick provisioning for maximum performance. FAST ware and System VP is another efficiency tool. Many enterprises EMC Avamar3 is uniquely suited for virtual 3 2 See The Clipper Group Navigator dated June 8, 2010, SSD=Solid State Disk. entitled EMC NetWorker and Avamar — An Integrated Pair Copyright © 2012 by The Clipper Group, Inc. Reproduction prohibited without advance written permission. All rights reserved.
  • 5. The Clipper Group Navigator TM February 10, 2012 Page 5 environments and offers deep integration with desktop and laptop PCs over a WAN connection VMware. It solves several virtualization chal- to an enterprise’s main data center, thereby con- lenges related to backup and recovery. solidating the backup process.  Very fast daily full backups through Deduplicating data in this way minimizes variable-length client-side and global the impact of backup on virtualized servers, so deduplication, backup to disk, and backups are faster and more reliable and enter- VMware integration. prises can maintain high utilization rates on vir-  Fast, one-step recovery through daily tualized servers without being constrained by the “full” backup and changed-block re- backup process. Avamar does a full backup ini- store through VMware integration. tially as a baseline and all subsequent backups  Virtualization-aware backup moni- are incremental. It organizes data so that each toring and management through in- incremental is presentable as a logical full back- tegration with VMware vCenter. up and restores are a one-step process. This  Guest, image, and off-host backup eliminates the tedious process of restoring the last “good full” and subsequent “incrementals” through applications and VMware in- to reach the desired recovery point. tegrations.  Dramatically reduces backup storage Disk-based backup has become mainstream because of its speed and reliability advantages capacity requirement and cost over tape. Tape may be too slow or unreliable to through variable-length deduplication. meet the data protection requirements of the  Virtual Avamar server option via business.4 It requires physical handling and can Avamar Virtual Edition virtual ap- be misplaced or damaged during loading, un- pliance, which leverages an existing loading, or transport. In contrast, disk is a faster VMware ESX server’s disk, storage, storage medium, especially because it can pro- CPU, and memory. cess random reads and writes immediately. It  Backup of physical and virtual envi- does not require handling and is resilient through ronments because most enterprises RAID and redundant components. Disk-based will continue to have both. storage can be checked daily for data integrity – Client-Side Deduplication Backup something that is not done with tape. Moreover, Avamar reduces backup data at the client be- data deduplication solutions, like Avamar, make fore transferring it across a network for storage disk-based backup feasible by effectively shat- on disk. It uses a variable-length, sub-file dedu- tering the cost barrier. plication algorithm to minimize the amount of Backup Across the Enterprise data being transported and, therefore, also mini- In addition to virtual environments, Avamar mizes network bandwidth and storage require- is particularly effective for remote and branch ments. Through a sophisticated identification office consolidated backup, desktops and lap- and communication process, Avamar eliminates tops, file servers, and NAS systems. redundant backup data within and across pro- Avamar’s client-side deduplication enables tected systems, wherever they exist in the enter- fast, daily full backups for remote office servers prise. According to EMC, Avamar reduces the and desktop/laptop systems via existing WAN required daily network bandwidth consumption links. Avamar automatically backs up systems by up to 99% and cumulative backend storage to an enterprise’s main data center, thereby con- can be reduced by up to 50 times (depending on solidating the backup process. Backup and re- the nature of the data) across sites and servers. covery becomes more manageable and reliable Avamar supports client-side deduplication of by leveraging the data center IT experts and databases related to applications, such as Mi- eliminating reliance on non-technical remote crosoft Exchange, SQL, and SharePoint, Oracle, workers and failure-prone local tape devices. IBM’s DB2 and Lotus Domino, and others. Avamar also offers an easy-to-use interface that Avamar is tightly integrated with VMware for enables desktop/laptop users to recover their backing up virtual machines. Avamar automati- own data quickly without involving the IT help cally backs up servers in remote offices and even 4 However, tape is still the lowest-cost option for long-term for Traditional and Deduplication Backup and available at data archiving. Avamar can export deduplicated backup data http://www.clipper.com/research/TCG2010028.pdf. to tape for long-term preservation. Copyright © 2012 by The Clipper Group, Inc. Reproduction prohibited without advance written permission. All rights reserved.
  • 6. The Clipper Group Navigator TM February 10, 2012 Page 6 desk, which boosts user productivity and frees IT environments is available, as well. The disad- staff to work on other projects. vantage of guest-level backup is, with multiple For NAS systems, the Avamar NDMP Ac- agents running simultaneously during the celerator provides fast, daily full backups and backup window; the agents compete for re- eliminates the need for recurring level-0 sources and can overload the system, limiting “dumps” that often exceed the available backup physical server consolidation. However, time window for completion. By eliminating while Avamar agents typically use 15% more this backup bottleneck, Avamar facilitates great- CPU than traditional backup agents, Avamar er NAS utilization and performance without lim- backups complete up to 10 times faster, reduc- iting the amount or size of files on the NAS de- ing the total client CPU utilization by up to vice. 85% over a seven-day period compared to tra- Avamar also supports disaster recovery, ditional methods and making daily full guest since deduplicated backup data can be efficiently backups faster and more efficient. replicated to an offsite location via existing  Image-level backup leverages the VMware WAN links. vStorage APIs for Data Protection (VADP) While many enterprises will retain tradition- for off-host backup of VMDK (virtual ma- al backup applications for some environments, if chine disk) files that encapsulate the entire vir- only because their backup processes are so well tual server, including VM configuration, oper- entrenched, Avamar can serve as the backup ap- ating system, and application. Backup agents plication for an entire data center or distributed are not required to run in each VM, as the case enterprise – both physical and virtual environ- with guest-level backup. Rather, the ESXi ments. Server takes a snapshot copy of each VM and presents it to a proxy server running Avamar VMware Integration agents (the proxy itself is a VM). Backup jobs Avamar is integrated with VMware vCenter flow directly over the network from the stor- Server. The Avamar management console ac- age array through the proxy to an Avamar Da- cesses vCenter Server directly, discovers new ta Store. The VNX also supports vProxy VMs automatically, and displays their current Server Load Balancing that automatically dis- backup status, whether guest or image backup or tributes backup jobs round robin among mul- unprotected. Administrators have instant visibil- tiple proxy servers, to speed up the backup ity to apply the appropriate backup policies. process and make the most of available re- This capability is very helpful for backup man- sources. The image-level approach facilitates agement in a world of VM sprawl and migrating faster backups, is non-disruptive to production VMs. For example, if a server administrator applications, and allows VMware to consoli- creates a new VM in response to a user request, date more workloads per physical server. Re- the backup administrator can automatically dis- coveries can be full VMDK files or individual cover it and apply a backup policy. With this files (but only for Windows). baseline protection in place, he can inquire with Related to image backup is a VMware fea- the server administrator about the level of data ture called Changed Block Tracking that time- protection it should have going forward. stamps changes to block data in VMDK files and Avamar supports both guest- and image- makes this information available through VADP. level backups for VMware environments. Avamar leverages Changed Block Tracking to  Guest-level backup is similar to traditional further speed backup and recovery times. backup for physical servers. It uses the same Avamar identifies the blocks that changed from backup agents, except agents run in the VMs last backup to the current state of the VM, and on an ESXi server. If 20 VM workloads are restore only those blocks – speeding restores to running on a physical server, 20 backup the production environment by 30 times, com- agents also are running. Guest-level backup is pared to traditional restores, according to EMC. the most familiar to traditional backup admin- When choosing between guest-level and im- istrators and offers a sense of continuity in age-level backup for your workloads, image- transitioning to a virtual environment. Appli- level is preferable because it is non-disruptive, cation consistency is available for guest-level offers greater resource efficiency, more address- backups using agents that integrate with spe- es more virtualization challenges, but there are cific applications like SQL or Oracle. File- limitations, such as application consistency, level restore for Windows, Linux, and Solaris where in-guest is the viable alternative. Copyright © 2012 by The Clipper Group, Inc. Reproduction prohibited without advance written permission. All rights reserved.
  • 7. The Clipper Group Navigator TM February 10, 2012 Page 7 Virtual Avamar Servers The EMC Avamar Virtual Edition for VM- ware is a virtual appliance for backup, recovery, and disaster recovery. Avamar Virtual Edition enables users to deploy Avamar deduplication technology in an easy and repeatable fashion on VMware ESXi Server hosts. Each virtual appli- ance supports up to 2TBs of deduplicated back- up capacity (which under a typical traditional backup schedule would require approximately 70TBs of tape or disk storage) and leverages the existing VMware shared server and storage in- frastructure to minimize costs and simplify man- agement. Avamar Virtual Edition supports vMotion for deployment flexibility and up to two virtual appliances per ESXi server. By sup- porting replication between Avamar virtual ap- pliances or from Avamar virtual appliances to physical Avamar servers (discussed next), it provides an alternative for offsite tape shipments and eliminates the risk of losing unencrypted data. EMC also offers physical Avamar Data Store servers packaged as an all-in-one solution consisting of EMC Avamar software running on preconfigured, EMC-certified hardware. The Avamar Data Store is available in a scalable multi-node model or a single-node model. The advantages of a packaged solution include streamlined purchasing, deployment, and on-site setup. Conclusion The cost, flexibility, and business agility benefits of virtualization far outweigh its chal- lenges. With thoughtful planning and the right technologies, you can enjoy smooth sailing on your virtualization odyssey and avoid getting caught up on the rocks of VM stall. So, take a close look at EMC VNX unified storage and Avamar deduplication backup software and sys- tem for your virtual environment. They are more than storage and backup elements for your infrastructure; they can also bring features and integration with VMware that solve your virtual- ization challenges. Avamar is also a great solution for back- up, recovery, and disaster re- covery of data residing in re- mote/branch offices, desk- tops/laptops, and NAS sys- tems. Together this combina- tion can transform your infra- structure and accelerate your virtualization odyssey. SM Copyright © 2012 by The Clipper Group, Inc. Reproduction prohibited without advance written permission. All rights reserved.
  • 8. The Clipper Group Navigator TM February 10, 2012 Page 8 About The Clipper Group, Inc. The Clipper Group, Inc., now in its twentieth year, is an independent consulting firm spe- cializing in acquisition decisions and strategic advice regarding complex, enterprise-class in- formation technologies. Our team of industry professionals averages more than 25 years of real-world experience. A team of staff consultants augments our capabilities, with significant experience across a broad spectrum of applications and environments.  The Clipper Group can be reached at 781-235-0085 and found on the web at www.clipper.com. About the Author Michael Fisch is a Senior Contributing Analyst for The Clipper Group. He brings 15 years of experience in the computer industry working in marketing, sales, and engineering, the last nine of which he has been an analyst with Clipper. Before Clipper, Mr. Fisch worked at EMC Corporation as a marketing program manager focused on service providers and as a competitive market analyst. Before that, he worked in international channel development, manufacturing, and technical support at Extended Systems (since acquired by Sybase). Mr. Fisch earned an MBA from Babson College and a Bachelor’s degree in electrical engineer- ing from the University of Idaho.  Reach Michael Fisch via e-mail at mike.fisch@clipper.com at 781-235-0085 Ext. 211. (Please dial “211” when you hear the automated attendant.). Regarding Trademarks and Service Marks , , , , , and “clipper.com” are trademarks of The Clipper Group, Inc., and the clipper ship drawings, “Nav- igating Information Technology Horizons”, and “teraproductivity” are service marks of The Clipper Group, Inc. The Clipper Group, Inc., reserves all rights regarding its trademarks and service marks. All other trademarks, etc., belong to their respective owners. Disclosure Officers and/or employees of The Clipper Group may own as individuals, directly or indirectly, shares in one or more companies discussed in this bulletin. Company policy prohibits any of- ficer or employee from holding more than one percent of the outstanding shares of any compa- ny covered by The Clipper Group. The Clipper Group, Inc., has no such equity holdings. After publication of a bulletin on clipper.com, The Clipper Group offers all vendors and users the opportunity to license its publications for a fee, since linking to Clipper’s web pages, post- ing of Clipper documents on other’s websites, and printing of hard-copy reprints is not allowed without payment of related fee(s). Less than half of our publications are licensed in this way. In addition, analysts regularly receive briefings from many vendors. Occasionally, Clipper an- alysts’ travel and/or lodging expenses and/or conference fees have been subsidized by a ven- dor, in order to participate in briefings. The Clipper Group does not charge any professional fees to participate in these information-gathering events. In addition, some vendors sometime provide binders, USB drives containing presentations, and other conference-related parapher- nalia to Clipper’s analysts. Regarding the Information in this Issue The Clipper Group believes the information included in this report to be accurate. Data has been received from a variety of sources, which we believe to be reliable, including manufacturers, dis- tributors, or users of the products discussed herein. The Clipper Group, Inc., cannot be held respon- sible for any consequential damages resulting from the application of information or opinions con- tained in this report. Copyright © 2012 by The Clipper Group, Inc. Reproduction prohibited without advance written permission. All rights reserved.