[DRBD-user] split brain in drbd dual primary setup

guohuai li guohuai_li at hotmail.com
Mon Dec 7 11:34:29 CET 2009

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

This is split brain problem. The bad thing for DRBD/heartbeat.


I think you need to give up the change in one node, and override it.


Detailed info:





> Date: Mon, 7 Dec 2009 01:01:03 +0530
> From: unnikrishnan.a at gmail.com
> To: drbd-user at lists.linbit.com
> CC: users at openvz.org; pacemaker at oss.clusterlabs.org
> Subject: [DRBD-user] split brain in drbd dual primary setup
> Hi,
> We are using a cluster setup something like :
> http://picasaweb.google.com/lh/photo/e_uAYjG-8nh7oRZzXDp5HA?feat=directlink
> We are using
> OpenVZ for Virtualization
> DRBD with ocfs2 in dual primary mode
> heartbeat + pacemaker for HA
> Currently I have not added the drbd in pacemaker. But added the VPS as
> resources in pacemaker, so that the VPS can fail over or fail back.
> My question is, if I remove the cross over cable that connects the
> drbd then the two server will run in
> Primary/Unknown state and since the heartbeat connection which is
> through another cable is not broken, the VPS will run in two nodes.
> So the data written to two drdb devices in two nodes are different and
> it is not possible to discard data in any node. What is the better
> solution for this problem. Please give some hints, thanks :-)
> -- 
> Regards,
> Unni
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