Re: [Xen-users] LVM snapshots to provide HA iSCSI storage

[<macscr@xxxxxxxxxx>]

In case you didnt know, clvm doesnt support snapshots.

On Tue, 09 Feb 2010 14:43:24 +0100, "Angel L. Mateo" <amateo@xxxxx> wrote:
> Hello,
> 
>       This is not a properly Xen problem, but I guess somebody has set out
> this same configuration, so I think you could help me. So sorry if you
> this is an offtopic message.
> 
>       We are planning to migrate our locally storaged VM (in LVM volumes) to
> a central storage, so we could you live migration and to provide HA
> mechanisms to our VM. For the central storage, we are planning to use
> iSCSI with LVM over it.
> 
>       The problem with this configuration is that if your iSCSI server (the
> target) fails, then all your VMs fail, and this a problem for us.
> 
>       So what we have thought is to use LVM to mirror our volumes. The idea
> is that the disk for a VM is in a iSCSI LVM volume:
> 
> * When we start a VM, then we create a mirror using the the iSCSI LVM
> and another volume in a local disk, then the VM uses this mirror.
> * If the iSCSI server goes down, there is no problem, because we have
> the local volume (when it goes up again, the mirror will synchronize the
> contents).
> * When we stop the VM, then we destroy the mirror and store the iSCSI
> volume.
> * When the migration, we destroy the mirror in the dom0 and create it in
> the other dom0.
> 
>       Running this scripts is not a problem, because we are going to use
> opennebule, where we can personalize the actions taking place in these
> situations.
> 
>       Is this posible? Does anybody use this idea (or similar)? Could anybody
> point me to some documentation?

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