[DRBD-user] Do I need dual-primary mode?

Lars Ellenberg lars.ellenberg at linbit.com
Tue Jun 5 09:34:42 CEST 2012

Note: "permalinks" may not be as permanent as we would like,
direct links of old sources may well be a few messages off.

On Mon, Jun 04, 2012 at 06:39:12PM +0200, Sebastian Kaps wrote:
> Hi,
> I'm having a two-node Corosync/Pacemaker cluster (active/passive) with XFS on two DRBD-volumes (SLES11 SP1 + HAE).
> The active node has both volumes mounted and if this node fails, the passive node should take over and mount these volumes.
> I'm aware that I can't mount XFS simultaneously on both nodes (which is not a problem).
> The setup runs fine so far, with both DRBD-volumes in dual-primary mode (and STONITH configured).
> But I'm currently not sure, if the dual-primary mode is actually needed,

Not at all.

> or if there's a way to run in safer primary/secondary mode.

Just do it.

> I think, in an earlier stage of this cluster and the disks being
> configured as primary/secondary, I've had problems to get the
> secondary disk promoted to primary after the old primary failed (i.e.
> was shut off).
> I remember a "refusing to be primary while peer is not outdated" message in that case, but that may have had other causes.
> What's the best/safest approach in my case?

: Lars Ellenberg
: LINBIT | Your Way to High Availability
: DRBD/HA support and consulting http://www.linbit.com

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