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I've been meaning to see if there's an existing blueprint for this
functionality.

Along with Gluster, qemu can launch instances directly in Ceph.

Right now, Nova has hard-coded using flat-files under
/var/lib/nova/instances.


On Thu, Apr 25, 2013 at 3:48 AM, Sylvain Bauza
<sylvain.bauza at digimind.com>wrote:

>  GlusterFS support is fully available since qemu-1.3, which makes
> possible to direcly address block devices in a glusterfs namespace.
>
> http://raobharata.wordpress.com/2012/10/29/qemu-glusterfs-native-integration/
>
> Unfortunately, I'm not aware of this integration effort in Nova. It would
> be great if one could specify GlusterFS as backend for instances and let
> Nova use qemu capabilities. Maybe it's already done or in progress, but I
> haven't heard any BP about of.
>
> Benchmarks are very impressive with glusterfs native support in qemu. I'll
> try to find out one.
>
> -Sylvain
>
> Le 25/04/2013 09:51, Razique Mahroua a écrit :
>
> Oh heck John that is one of a feature :D
>
>  Jacob, that's what I do - I mount glusterFS on /var/lib/nova/instances
> and the backend is a distributed replicated volume (replica 4) that the
> nodes themselves are part of.
> The only thing you need to make sure is to allocate enough space - and
> disable the auto suppression of the unused base images.
> Performance-wise, I came up with good figures - the network was the
> bottleneck, not so much the Gluster FS itself. I'll run soon extra benches
> (I use iozone3 everytime) on the production environment that will have the
> exact same setup). Make sure to use the last stable version as well :)
>
>  regards,
>
>  *Razique Mahroua** - **Nuage & Co*
> razique.mahroua at gmail.com
> Tel : +33 9 72 37 94 15
>
>
>  Le 25 avr. 2013 à 02:41, Jacob Godin <jacobgodin at gmail.com> a écrit :
>
>  Hey John,
>
>  Thanks for the info! Have you had anyone simply using GlusterFS mounted
> to /var/lib/nova and running instances that way? I'd be interested in
> hearing some results if any.
>
>  Cheers,
> Jacob
>
>
> On Wed, Apr 24, 2013 at 4:51 PM, John Mark Walker <johnmark at redhat.com>wrote:
>
>>
>>
>>  ------------------------------
>>
>> I ended up using Gluster as a shared storage for instance and Ceph for
>> Cinder/ Nova-volume and admin storage as well.
>> works perfectly!
>>
>>
>>  For the record, this is what I usually recommend. Whenever someone asks
>> me "Gluster or Ceph?" I ask them "for which part?" We (being the Gluster
>> team) devoted almost all of our time to developing a scale-out NAS
>> solution, which works well for shared storage for tenants in the cloud. We
>> didn't really start to work on GlusterFS for hosting VMs until last year.
>>
>>  For the curious among you, feel free to try out our new KVM/QEMU
>> integration pieces which are available in GlusterFS 3.4, which is currently
>> in alpha with a beta coming soon:
>> http://download.gluster.org/pub/gluster/glusterfs/qa-releases/  - NOTE:
>> it's in alpha! It will probably break! Do not run in production!
>>
>>  I'd be very curious to hear how this works out for openstack users,
>> particularly given our recent Cinder integration. Note that this requires
>> QEMU >= 1.3 to utilize the new integration bits. To read a bit more about
>> it, along with some links to howtos, see this blog post:
>>
>>    http://www.gluster.org/2012/11/integration-with-kvmqemu/
>>
>>  Again - this is alpha code, so I can't recommend using it for any
>> production system, anywhere. But if you're interested in putting it through
>> its paces, I'd love to hear how it goes.
>>
>>  Happy hacking,
>>  John Mark Walker
>>  Gluster Community Lead
>>
>>
>>
>
>
>
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-- 
Joe Topjian
Systems Administrator
Cybera Inc.

www.cybera.ca

Cybera is a not-for-profit organization that works to spur and support
innovation, for the economic benefit of Alberta, through the use
of cyberinfrastructure.
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