Support Cinder scheduler hints

https://blueprints.launchpad.net/heat/+spec/cinder-scheduler-hints

When creating volumes with Cinder, passing scheduler hints can be necessary to select an appropriate back-end. This spec proposes to add a ‘scheduler_hints’ option for OS::Cinder::Volume objects, as is it already done for OS::Nova::Server.

Problem description

Currently, it is not possible to pass hints to the Cinder scheduler when using Heat to create volumes.

Proposed change

Add a new optional key-value map (named ‘scheduler_hints’) for OS::Cinder::Volume resources. A user can pass hints to the Cinder scheduler by specifying one or more keys-values in scheduler_hints.

Alternatives

None

Usage Scenario

For instance, request creation of volume-A on a different back-end than volume-B using the different_host scheduler hint:

resources:
  volume-A:
    type: OS::Cinder::Volume
    properties:
      size: 10
      scheduler_hints: {different_host: {Ref: volume-B}}

Implementation

Assignee(s)

Primary assignee:
adrien-verge

Milestones

Target Milestone for completion:
Kilo-1

Work Items

  • Extend OS::Cinder::Volume to support a new ‘scheduler_hints’ option
  • When set, pass this option to the Cinder client

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