[openstack-dev] [nova][cinder] How will nova advertise that volume multi-attach is supported?

Matt Riedemann mriedem at linux.vnet.ibm.com
Thu Jan 14 16:03:46 UTC 2016

On 1/14/2016 9:42 AM, Dan Smith wrote:
>> It is however not ideal when a deployment is set up such that
>> multiattach will always fail because a hypervisor is in use which
>> doesn't support it.  An immediate solution would be to add a policy so a
>> deployer could disallow it that way which would provide immediate
>> feedback to a user that they can't do it.  A longer term solution would
>> be to add capabilities to flavors and have flavors act as a proxy
>> between the user and various hypervisor capabilities available in the
>> deployment.  Or we can focus on providing better async feedback through
>> instance-actions, and other discussed async api changes.
> Presumably a deployer doesn't enable volumes to be set as multi-attach
> on the cinder side if their nova doesn't support it at all, right? I
> would expect that is the gating policy element for something global.

Is there a policy in cinder for that though? /me looks....

> Now, if multiple novas share a common cinder, then I guess it gets a
> little more confusing...
> --Dan
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Matt Riedemann

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