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

unni krishnan unnikrishnan.a at gmail.com
Mon Dec 7 14:15:32 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 were I am stuck. In my case the drbd will only detect the
split brain only after the connection between the two nodes were
established. In this case the two servers will be running and writing
separate data in the two drbd devices and no one will notice since the
drbd will not alert about split brain since it will not detect split
brain in stand alone condition.

2009/12/7 guohuai li <guohuai_li at hotmail.com>:
> 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:
>  http://www.drbd.org/users-guide-emb/users-guide.html
> regards,
> Edward
>> 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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