[DRBD-user] strange split-brain problem

Felix Frank ff at mpexnet.de
Tue Dec 7 10:09:46 CET 2010

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

On 12/06/2010 06:08 PM, Klaus Darilion wrote:
> So, why again resynchronizing almost 500Mb although the partition is not
> used at all (just mounted in a domU).

It does this based on the activity log. See
http://www.drbd.org/users-guide/s-activity-log.html for the details.

> When I tried to manually attach the device I got error messages:
> "Split-Brain detected, dropping connection".

Split brain happens when the following happen in order:
1. you loose connection while having a primary
2. the other node becomes primary while still disconnected

> So, suddenly this one device is not connected anymore. All the other
> drbd devices are still connected and working fine - only this single
> device is making problems, although it has identical configuration.

So this is the device with the splitbrain condition?

You will need to resolve that, refer to

Have you made sure that your /etc/rc6.d and rc0.d have "stop" links to
the drbd init script? We have seen splitbrain upon reboot as well, and I
believe that missing init links were the reason.


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