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On 12/19/2016 2:24 AM, Avishay Traeger wrote:
> 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 <mailto: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/
>         <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
>     <http://eavesdrop.openstack.org/#Cinder,_Nova>
>
>     --
>
>     Thanks,
>
>     Matt Riedemann
>
>
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>
> --
> *Avishay Traeger, PhD*
> /System Architect/
>
> Mobile: +972 54 447 1475
> E-mail: avishay at stratoscale.com <mailto:avishay at stratoscale.com>
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The live migration CI job runs Rbd-backed block live migration but we 
haven't yet enabled that for volume-backed live migration, but I thought 
that was possible, and was a big reason why a lot of deployments choose 
Ceph for storage, the ease of use for live migration. Timofey Durakov 
has been working on enabling the volume-backed live migration + Ceph 
storage in our CI jobs so he'd know more.

-- 

Thanks,

Matt Riedemann