Open Stack

My understanding is that the --instances_path will be the share to which the VM state will be synced on the source hypervisor. This synced image will then be used to restart the VM at  the destination hypervisor. Ideally, I'd like to avoid having a local copy of the VM state in order to provide persistence in VMs so that if the hypervisor fails or crashes, etc. the VM state on a Gluster volume can be used to restart it. I am not sure whether this is possible in OpenStack yet or if KVM will even support using a shared mount as a VM state storage. This is something I will be looking into. Of course, some references to docs, emails will be nice . Thanks.


________________________________________
From: masumotok at nttdata.co.jp [masumotok at nttdata.co.jp]
Sent: Monday, June 06, 2011 6:23 AM
To: Shehjar Tikoo
Cc: openstack at lists.launchpad.net; soren at linux2go.dk
Subject: RE: [Openstack] Integrating GlusterFS with OpenStack

Hi,

> When doing live migration, we could let KVM migrate the
> VM state and somehow tell gluster to migrate the disk image to the new
> host (to maintain locality between the virtual machine and its storage).
> Gluster already has the means to do live rebalancing, but I don't believe
> an API to specify "I'd like for this particular file to reside on this
> particular brick. Please make it so". That would *rock*.

In current openstack live migration feature, a flag --instances_path specifies the path which has to be on shared storage. Live re-balancing sounds like good idea, and I think at least, just "--instances_path is on the glusterFS" is good option to users.
If you want any help, my colleague and me would love to do ^^;


> -----Original Message-----
> From: openstack-bounces+masumotok=nttdata.co.jp at lists.launchpad.net
> [mailto:openstack-bounces+masumotok=nttdata.co.jp at lists.launchpad.ne
> t] On Behalf Of Soren Hansen
> Sent: Monday, June 06, 2011 7:40 AM
> To: Shehjar Tikoo
> Cc: openstack at lists.launchpad.net
> Subject: Re: [Openstack] Integrating GlusterFS with OpenStack
>
> 2011/6/3 Shehjar Tikoo <shehjart at gluster.com>:
> > We're aiming to integrate Gluster with Openstack in a way that allows
> > GlusterFS to be used as the storage for application volumes as well
> as VMs.
> > I am interested in hearing your ideas on how such an integration can
> > be performed. Being the openstack experts, could you please share some
> > issues I should be considering, the problems I may run into or
> > anything else you think I should know.
>
> One thing I'd love to be able to do is store my virtual disks on a gluster
> filesystem that is shared across my compute nodes. The data would be
> stored on the host that is actually running the virtual machine (think
> NUFA scheduler). When doing live migration, we could let KVM migrate the
> VM state and somehow tell gluster to migrate the disk image to the new
> host (to maintain locality between the virtual machine and its storage).
> Gluster already has the means to do live rebalancing, but I don't believe
> an API to specify "I'd like for this particular file to reside on this
> particular brick. Please make it so". That would *rock*.
>
> --
> Soren Hansen        | http://linux2go.dk/ Ubuntu Developer    |
> http://www.ubuntu.com/ OpenStack Developer | http://www.openstack.org/
>
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