On Thu, Dec 23, 2010 at 11:23 AM, Tim Mauerbach < [email protected]> wrote:
> I am thinking about the structure of a new mailserver on top of > raid1/lvm/xen. > > Two different approaches come to my mind: > > 1. One big LV as DRBD backing device for the whole guest (os + data). > 2. One small LV without drbd for the base system + one big LV as DRBD > backing device only for data (maildirs+mariadb). > > Is the maintenance overhead of 2 worth the performance gain? > I'd definitely go with 1, and it has nothing to do with performance. If you put the whole VM on top of DRBD, and then make that a primary/primary (aka active/active) DRBD then you can live-migrate the VM between host and/or use Remus VM-mirroring for VM-HA. I don't see why anyone would ever go with 2 as leaving the OS unreplicated on the small LV exposes you to big potential downtime as you rebuild a new OS for the replicated-data in the event of a failure. Am I misinterpreting what you mean? -JR
_______________________________________________ drbd-user mailing list [email protected] http://lists.linbit.com/mailman/listinfo/drbd-user
