[DRBD-user] examples of dual primary DRBD

Lars Ellenberg lars.ellenberg at linbit.com
Mon Oct 10 11:30:28 CEST 2011

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


On Sat, Oct 08, 2011 at 01:31:28PM +0200, Bart Coninckx wrote:
> On 10/08/11 00:25, Lars Ellenberg wrote:
> >On Fri, Oct 07, 2011 at 10:21:08PM +0200, Bart Coninckx wrote:
> >>On 10/06/11 22:03, Florian Haas wrote:
> >>>On 2011-10-06 21:43, Bart Coninckx wrote:
> >>>>Hi all,
> >>>>
> >>>>would you mind sending me examples of your crm config for a dual primary
> >>>>DRBD resource?
> >>>>
> >>>>I used the one on
> >>>>
> >>>>http://www.drbd.org/users-guide/s-ocfs2-pacemaker.html
> >>>>
> >>>>and on
> >>>>
> >>>>http://www.clusterlabs.org/wiki/Dual_Primary_DRBD_%2B_OCFS2
> >>>>
> >>>>and they both result into split brain, except for when I start drbd
> >>>>manually first.
> >>>
> >>>They clearly should not. Rather than soliciting other people's
> >>>configurations and then try to adapt yours based on that, why don't you
> >>>upload _your_ CIB (not just a "crm configure dump", but a full "cibadmin
> >>>-Q") and your DRBD configuration to your pastebin/pastie/fpaste and let
> >>>people tell you where your problem is?
> >>
> >>OK, I posted the drbd.conf on http://pastebin.com/SQe9YxhY
> >>
> >>cibadmin -Q is on http://pastebin.com/gTZqsACq
> >>
> >>The split brain logging is on http://pastebin.com/7unKKkdi .
> >
> >I somehow think you added some "--force" or "--overwrite-data-of-peer"
> >to some drbdadm/drbdsetup primary invocation?
> 
> Hi,
> 
> I re-created the metadata to start all over, and the
> 
> drbdadm -- --overwrite-data-of-peer primary r_test
> 
> command has to been done according to SLES docs for the initial sync.
> 
> So if that particular command is the problem, we either have faulty
> documentation or me wrongly interpreting the docs.

Sure. On _one_ node only.
Not on both, which I think you did.

If you did not, you'd need to post your log from _before_, from where
the drbd was last connected before it then detected the data divergence
(aka "split-brain").

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



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