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Multi-attach also happens during VM migration: (attach volume to
destination host, move VM to destination host, detach volume from source
host).  It's not clear if rbd's limitation affects this as well - it's not
clear from the bug report or the patch.

On Thu, Dec 15, 2016 at 1:30 AM, Matt Riedemann <mriedem at linux.vnet.ibm.com>
wrote:

> On 12/14/2016 3:53 PM, Shane Peters wrote:
>
>> Hello all,
>>
>> Per https://review.openstack.org/#/c/283695/ multi-attach was disabled
>> for rbd volumes.
>>
>> Does anyone know what features are missing or aren't compatible in rbd
>> for it to support multi-attach?
>>
>> Thanks
>> Shane
>>
>>
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>>
> Nova doesn't support multiattach volumes for any Cinder backend. That's
> being worked by the Nova and Cinder teams but won't be something that's
> implemented on the Nova side in the Ocata release, and will be a stretch
> probably for Pike. There are weekly meetings about this though, see:
>
> http://eavesdrop.openstack.org/#Cinder,_Nova
>
> --
>
> Thanks,
>
> Matt Riedemann
>
>
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