Re: [Xen-users] combine DRBD and LVM for live migration and snapshot capabilities

["Olivier B." <xen.list@xxxxxxxxx>]

Excepting pacemaker, I have that kind of setup.

It works, but per security I enable the dual primary setup only while doing a 
live migration.
Otherwise, in case of an error with Pacemaker, you will destroy your data.

Olivier


On 25/09/2011 21:12, Bart Coninckx wrote:
> Hi all,
>
>
> I'd like to have your ideas on this Xen HA setup:
>
> - two DRBD machines, capable of dual primary
> - per virtual machine a nested DRBD config, meaning: VG-LV-DRBD-VG-LV. The 
> bottom LVM config is to expand the DRBD device if needed. The top one is for 
> the virtual machine itself.
> - setting at least the top layer VG to active on both node.
> - have Pacemaker handle the virtual machines as cluster resources.
>
> Since the upper LVM config is active on both nodes, I would think a live 
> migration should work. Am I right?
>
> I would also think a snapshot can be taken from the top LV (after a xm save and 
> before a xm restore) for backup purposes. Would this harm anything? If 
> Pacemaker makes sure only one node can run a particular virtual machine, I 
> would think things are OK, but I could be sorely mistaking.
>
> thx!!
>
> B.
>
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