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

[Bart Coninckx <bart.coninckx@xxxxxxxxxx>]

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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