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Cinder

Project overview and update

Jay Bryant (Cinder PTL)

IRC: jungleboyj

Twitter: @jungleboyj

May 1, 2019

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What does Cinder do?

Provide block storage service
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.

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Project background

Founded during the Folsom release of OpenStack
158 contributors in Rocky

Latest user survey adoption numbers:

Deployed: [89%] (consumers indicate they are using this project in production or test phase; 86% in production and 3% in test)

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Mid-Cycle Meeting

February 5th - 7th at Morrisville Lenovo Site
Approximately 5 people in Physical Attendance
Approximately 8 people remotely participated
Was a productive week

Mmmm, Carolina BBQ! ----->

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Agenda

The State of Cinder
Update on Stein release
Priorities for Train

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The State of Cinder

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Contributions

Slow decline of commits during the last few releases
Why?

Transition from new feature development to bug fixing and User Experience improvements
Drivers have stabilized and are more reliable

Is this good?

Yes!
Cinder is a more mature and stable offering

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Participation

Continue to have diverse participation from multiple companies

Huawei
Lenovo
Red Hat
Dell/EMC

Retaining expertise
Core contributor list has changed but remains stable in numbers
Reviews roughly track based on numbers of commits

Always room for improvement

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Drivers

Number of supported drivers remains high at 61

Down from 80+ at its peak
Has remained stable for the last few releases with about the same number going out as coming in

Both Fibre Channel Zone Manager drivers have had support returned
Continue to see Ceph as the most adopted

Remains a development focus

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Bottom Line

Cinder’s participation remains consistent and healthy
Cinder’s breadth continues to expand

Standalone Cinder
cinderlib

See deployers and SDS vendors looking to Cinder as we have already solved the hard problems
Anticipate more use cases beyond OpenStack in the future

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Stein Release Update

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New Drivers

New drivers in Stein

Hedvig Storage
Inspur AS13000
Storage Performance Developer Kit (SPDK)

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Unsupported/Removed Drivers

Following drivers failed to maintain 3rd party CI and have been marked unsupported:

Nexenta Edge
Tintri
Veritas HyperScale

Following drivers were removed after the deprecation period

CoprHD
ITRI DISCO
HGST Flash Storage Suite

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Multi-Attach

The RBD (Ceph) driver has added multi-attach support!

Currently replication and multi-attach are mutually exclusive
A single RBD driver can only support one at a time
More improvements coming

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Driver Initialization Improvements

Added reinit_driver_count option

Indicate the maximum number of times to retry driver re-initialization after a failure.
Exponential backoff
Default value of 3

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RBD Deferred Deletion Support

Can have deleted volumes tagged for deletion but they are not removed until a later time (enabled_deferred_deletion=True)
Disabled by default
Can be tuned:

deferred_deletion_delay
deferred_deletion_purge_interval

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Upgrade Checker

Community goal for stein
Allows administrators to check their environment to ensure compatibility with the new Cinder release
‘cinder-status upgrade check’
A few checks included in Stein, expect to see more in Train

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Tech Preview Release of cinderlib

The next step beyond Standalone Cinder
Allows Cinder’s drivers to be used without any Cinder services
Tested drivers:

RBD/Ceph
LVM
XtremIO
Kaminaro
Solidfire

Nice overview of the project: https://gorka.eguileor.com/cinderlib/
Currently in use as part of oVirt and Ember-CSI

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Review Priority Tracking

Cores now marking reviews with a priority

High Priority
Priority
Blocked

Can see the categorized reviews here: http://tiny.cc/CinderPriorities

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Documentation Improvements

Continuing to focus on getting documentation changes in with code changes
Have expanded and improved the Cinder Driver Support Matrix

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Priorities for Train

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New features & enhancements Planned for Train

A reminder that this is just a statement of plan … actual mileage may vary.
Priorities will be discussed at the Train PTG later this week.
Keep the most up-to-date list of work and priorities in our etherpad: https://etherpad.openstack.org/p/cinder-spec-review-tracking