Re: [openstack-dev] multi-attach-volume for rbd

2016-12-19 Thread Matt Riedemann 

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
> 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


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Thanks,

Matt Riedemann


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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.


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Thanks,

Matt Riedemann


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Re: [openstack-dev] multi-attach-volume for rbd

2016-12-19 Thread Avishay Traeger 
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 
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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>> Unsubscribe: openstack-dev-requ...@lists.openstack.org?subject:unsubscrib
>> e
>> http://lists.openstack.org/cgi-bin/mailman/listinfo/openstack-dev
>>
>>
> 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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-- 
*Avishay Traeger, PhD*
*System Architect*

Mobile: +972 54 447 1475
E-mail: avis...@stratoscale.com



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Re: [openstack-dev] multi-attach-volume for rbd

2016-12-14 Thread Matt Riedemann 

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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