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Ibm spectrum scale fundamentals workshop for americas part 4 spectrum scale_replication_and_stretch_clusters
1.
Course materials may
not be reproduced in whole or in part without the prior written permission of IBM. Spectrum Scale Replication & Stretch Clusters © Copyright IBM Corporation 2015
2.
Unit objectives After completing
this unit, you should be able to: • Describe Replication • Describe the Pros and Cons of Replication • Describe a Stretch Cluster © Copyright IBM Corporation 2015
3.
Synchronous data replication •
Allows you to synchronously replicate – A file, set of files or the entire file system • Gives you better replication granularity as opposed to mirroring an entire volume, which also saves on space used – Allows you to replicate Metadata and/or data – Provides additional layer(s) of protection in addition to the RAID level protection of volumes underneath – Supports a maximum of 3 copies of the data – Replication is Synchronous only – Asynchronous Replication can be achieved using AFM feature © Copyright IBM Corporation 2015
4.
Synchronous data replication •
To replicate or not replicate? – This is Spectrum Scale level of replication which is an availability level "on top of" the already built-in data availability (RAID) characteristics of the disk subsystem(s) being used – Can be used cross site – Some performance impact. Writes are 50 – 67% slower with replication levels 1 & 2 Reads are the same speed – Your storage effectively becomes more expensive since you are using more of your usable space for duplicate copies of your data © Copyright IBM Corporation 2015
5.
Data Replication Warnings •
If you decide to use Replication – Always replicate your Metadata at the minimum – Never replicate your data and not your metadata • If you were to do this, then in the event of a failure, you would not be able to mount your file system to retrieve your replicated data © Copyright IBM Corporation 2015
6.
Replication relies on
failure groups • Failure group – A group of disks in a storage pool that Spectrum Scale assumes are separate from the disks other failure groups. – Can be changed anytime (mmrestripefs to fix data) • A file is replicated when a copy of the data blocks exist in two failure groups – Ensures that no two replicas of the same block will become unavailable due to a single failure. • Can be set either at NSD creation time using the mmcrnsd command or later on using the mmchdisk command. • Important to set failure groups correctly to have effective file system replication. • Replication is per storage pool. © Copyright IBM Corporation 2015
7.
The third failure
group File System Descriptor Quorum • In addition to quorum nodes three disks, by default (NSDs) are used as file system descriptors disks. • A majority of the replicas on the subset of disks must remain available to sustain file system operations. • Spectrum Scale can move them from one disk to another in case of failure. • Use the mmlsdisk –L command to see the location of the descriptor. • Can add one by creating a descOnly NSD. © Copyright IBM Corporation 2008 Disk Descriptor Quorum Node 1 Node 2
8.
Replication/Failure groups and
storage pools • Creation of NSD requires [ mmcrnsd ] – O/S disk name – NSD Server List • Optional, but recommended – NSD name – Failure Group (related to Replication) – Storage Pool (related to Policy / ILM ) • Disk Stanza %nsd: device=/dev/sdav2 nsd=nsd1 servers=k145n06,k145n05 usage=dataOnly failureGroup=5 pool=poolA © Copyright IBM Corporation 2015
9.
Accessing replicated data •
Default operation – Read: read from all copies – Write: write both copies • Control with readReplicaPolicy – Local: Read from block device or NSD server on same subnet – Used for read heavy workload replicated across distance • Operation with unavailable disk – Disk marked “down” in FS descriptor – Read: read available copy – Write: • Log changes for fast recovery (possible performance impact) • Set “missing update” flag in the inode • Write available copy • Recovery – Replay only changes to restored storage © Copyright IBM Corporation 2015
10.
Replication examples • Full
Replication – 2 Failure Groups – Data and Metadata – On failure file system all ok • Metadata Replication – Replicate only metadata – On failure data missing file system stays mounted Failure Group 1 Failure Group 2 Failure Group 1 Failure Group 2 Failure Group 3 Failure Group 4 inode inode Missing Data Metadata OK Failure Group 3 (Desc Only) © Copyright IBM Corporation 2015
11.
Mixing replication with
pools • Replicate only metadata • 3 Data pools for capacity and single namespace © Copyright IBM Corporation 2015
12.
• Multi-site quorum
configuration • Replicate across sites • Bandwidth requirements based on application • Often called - Two sites and a laptop • Distributed data – data is distributed across 2 sites, 3rd site contains quorum node for availability • Sites A and B – Contain the core Spectrum Scale nodes and storage – Multiple quorum nodes in each site • Site C – Contains a single quorum node – Serves as tie breaker if one of the other sites becomes inaccessible – File System Descriptor NSD Reliability: Multiple site High availability Single Spectrum Scale System Site A Site B Site C WAN © Copyright IBM Corporation 2015
13.
Recovering from a
storage failure • Fix replication using mmrestripefs mmrestripefs -R • Usage: mmrestripefs Device {-m | -r | -b | -p | -R} [-P PoolName] [-N {Node[,Node...] | NodeFile | NodeClass}] © Copyright IBM Corporation 2015
14.
Review • Replication can
be on a single file or a whole file system • Replication is spread across failure groups • Replication is even more important when you do not have any RAID support underneath for your volumes • Replication is always synchronous • Asynchronous Replication is covered by another feature called Active File Management (AFM) © Copyright IBM Corporation 2015
15.
Course materials may
not be reproduced in whole or in part without the prior written permission of IBM. Spectrum Scale Stretch Clusters © Copyright IBM Corporation 2015
16.
Spectrum Scale Stretch
Clusters • Stretch Clusters combine two or more clusters together to make one giant cluster • Stretch Clusters are intended for inter-site or close proximity clusters, not over WAN unless the amount of data is small • Replication is not required, but is usually the intention for a stretch cluster • If replication between clusters is not the goal, then you might possibly prefer using a multi-cluster set up. • If replication is the goal, but it’s between data centers using a WAN, then AFM may be a better choice if synchronous replication is NOT required. © Copyright IBM Corporation 2015
17.
© 2013 IBM
Corporation Spectrum Scale Architecture (Basics) SAN, Shared SAS, Twin Tailed, etc. LUN = Logical Unit Number / NSD = Network Shared Disk 1 SAN LUN Spectrum Scale NSD „1:1“ Relation
18.
© 2013 IBM
Corporation Spectrum Scale Architecture (Basics) SAN LUN = Logical Unit Number / NSD = Network Shared Disk 1a SAN (etc) LUN Spectrum Scale NSD „1:1“ Relation Twin-tailed SAS
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© 2013 IBM
Corporation Spectrum Scale Architecture (Common) SAN LAN LUN‘s Spectrum Scale NSD Client Spectrum Scale NSD Server 2
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© 2013 IBM
Corporation Spectrum Scale Architecture (Typical) SAN LAN / WAN / Infiniband & any Mixture 3 + Twin-Tailed Disks + Internal Disks FPO FPO (FPO = File Placement Optimizer) Spectrum Scale replication of data on disk One (or multiple) filesystems Files placed on different devices under policy control Spectrum Scale NSD Clients Spectrum Scale NSD Server LUNs
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© 2013 IBM
Corporation LUN‘s NSD Clients NSD Server (NSD = Network Shared Disk) LAN Infiniband remote cluster Remote Cluster Mount (synchronous) local cluster 4
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© 2013 IBM
Corporation LUN‘s NSD Clients NSD Server Inter-site LAN Local LAN Stretch Cluster (synchronous) 4a Quorum node at 3rd site Local LAN Spectrum Scale replication of data between sites Filesystem active across both sites Site 2Site 1
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© 2013 IBM
Corporation LUN‘s NSD Clients NSD Server (NSD = Network Shared Disk) WAN Infiniband remote cluster Spectrum Scale Advanced File Management (async)local cluster Caching (R/W) 5
24.
Exercise 4 Replication Exercise © Copyright
IBM Corporation 2015
25.
Unit summary Having completed
this unit, you should be able to: • Describe replication • Describe a Stretch Cluster © Copyright IBM Corporation 2015
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