Sort instances if possible inside an host aggregate

Registered by Jean-Daniel Bonnetot on 2015-05-13

Simple use case: Reduce the licence cost
Windows licences are billed by host or by socket. The goal is to stack all Windows instances on the same hosts as much as possible without creating a new host aggregate.

As much as possible means this is a best effort feature, if nova can place this new Windows instance on a compute where other Windows are running, do it. If not, spawn it where you want or on a empty compute to identify it as « preferred widows compute » for future windows spawn.

This use case could be extended to many other situations, every time you have a preferred situation with no hard restrictions.

Blueprint information

Status:
Not started
Approver:
None
Priority:
Undefined
Drafter:
Jean-Daniel Bonnetot
Direction:
Needs approval
Assignee:
None
Definition:
New
Series goal:
None
Implementation:
Unknown
Milestone target:
None

Related branches

Whiteboard

Gerrit topic: https://review.openstack.org/#q,topic:same-instances-scheduling,n,z

Addressed by: https://review.openstack.org/182758
    Sort instances if possible inside an host aggregate

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Work Items

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