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OpenStack Cinder, Implementation Today and New Trends for Tomorrow
1. OpenStack Block Storage
Cinder – Implementations for Today and Trends
for Tomorrow
Ed Balduf, Cloud Solutions Architect - OpenStack, ed.balduf@solidfire.com @madskier5
2. ● Ephemeral
● Non-Persistent
● Life Cycle coincides with an Instance
● Usually local FS/QCOW file
● Object
● Manages data as.. well, an Object
● Think photos, mp4’s etc
● Typically “cheap and deep”
● Commonly SWIFT
● Shared FS
● We all know and love NFS
● My be managed by Manila
● Glance???
OpenStack = Many Storage Pieces
● Block
● Foundation for the other types
● Think raw disk
● Typically higher performance
● Cinder
4. Cinder Mission Statement
To implement services and libraries to provide on demand, self-service
access to Block Storage resources. Provide Software Defined Block
Storage via abstraction and automation on top of various traditional
backend block storage devices.
To put it another way...
Virtualize various Block Storage devices and abstract them in to an
easy self serve offering to allow end users to allocated and deploy
storage resources on their own quickly and efficiently.
5. How it works
● Plugin architecture, use your own vendors
backend(s) or use the default
● Backend devices invisible to end-user
● Consistent API regardless of backend
● Filter Scheduler let’s you get get fancy
● expose differentiating features via custom
volume-types and extra-specs
9. Reference Implementation Included
● Includes code to provide a base implementation using LVM
● Just add disks
● Great for POC and getting started
● Sometimes good enough
● Might be lacking for your performance, H/A and Scaling needs (it all depends)
● Can Scale by adding Nodes
● Cinder-Volume Node utilizes it’s local disks (allocate by creating an LVM VG)
● Cinder Volumes are LVM Logical Volumes, with an iSCSI target created for each
➔ Typical max size recommendations per VG/Cinder-Volume backend ~ 5 TB
➔ No Redundancy (yet)
20. Pets <- Cattle(Cinder) -> Chickens?
§ Traditional (Enterprise) infrastructure is individualized.
§ Cloud native applications are transitory and disposable.
§ Containers are more efficient, more numerous and more transitory than VMs.
§ Uptime responsibility shift
§ Enterprise (traditional) -> Infrastructure
§ Cloud and Containers -> Applications and DevOps
21. Enterprise Apps and IT orgs on cloud
Apps
§ Monolithic
§ Stateful
§ Shared Storage
§ Connected (LDAP, Org DB)
§ Long startup times
§ Multi-volume
§ Active-passive
IT Organizations
§ Business Driven
§ Politically driven
§ Cost burden (single)
§ Overworked
§ Hierarchical/divided
§ Legacy burden
§ Prized, expensive apps
§ Packaged software
How do you manage it all
on a modern cloud?
22. Protecting Legacy Apps in the Cloud
§ Live Migration
§ Available in OpenStack today on both shared storage and block storage.
§ Some drivers are broke.
§ Replication
§ V1 in Kilo, V2 in work for Liberty.
§ Fibre Channel
§ Available in OpenStack today. 24 drivers of 37 block drivers as of 8/19
§ HA connections and Multi-Attach
§ HA: in process, maybe for Liberty.
§ Multi-attach: Cinder -> Liberty, Nova -> Mitaka (maybe)
§ Consistency Groups
§ In Juno. Only 6 drivers as of Kilo
§ Backup
23. Managing Enterprise in an Enterprise Cloud
§ Lack of Chargeback/lookback
§ Lack of Chargeback is holding the enterprise back.
§ No enforcement of what anyone uses.
§ QoS Quotas and/or Hierarchical quotas
§ How to do you Quota a Group or subgroup?
§ How do you extend quota s to QoS?
§ Custom catalogs
§ Private Volume Types are available in Kilo.
24. “No matter how much we try to change the
expectation of users to align with ‘cloud,’ they
still complain when I reboot things.
So I gotta have live migration.”
25. Making choices
can be the
HARDEST part!
● Each has their own merits
● Some excel at specific use cases
● Maybe you already own the gear
● TCO, TCO, TCO
Ask yourself:
➔ Does it scale?
➔ Is the architecture a good fit?
➔ Is it tested, will it really work in OpenStack?
➔ Support?
➔ What about performance and noisy neighbors?
➔ Third party CI testing?
➔ Active in the OpenStack Community?
➔ DIY, Services, both/neither
(SolidFire AI, Fuel, JuJu, Nebula….)
26. Cinder – Liberty
● Brick (Multi-attach, HA-connections)
● Volume Migration: Support Ceph
● Replication
● Universal Image caching
● Import/export snapshots
● Force delete backups
● Volume Metadata enhancements
● Nested Quotas
● Guru reports, better accounting for operators
● RemoteFS: (NFS, Gluster) Snapshots, Clones, and assisted Snapshots
● Support iSCSI HW offload
● DB: Archive, DB2
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