[DRBD-user] split-brain on Ubuntu 14.04 LTS after reboot of master node

Digimer lists at alteeve.ca
Sun Nov 15 16:04:02 CET 2015

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

On 15/11/15 05:03 AM, Waldemar Brodkorb wrote:
> Hi,
> Digimer wrote,
>>> property $id="cib-bootstrap-options" \
>>>         dc-version="1.1.10-42f2063" \
>>>         cluster-infrastructure="corosync" \
>>>         stonith-enabled="false" \
>> And here's the core of the problem.
>> Configure and test stonith in pacemaker. Then, configure drbd to use
>> 'fencing resource-and-stonith;' and configure 'crm-{un,}fence-peer.sh as
>> the {un,}fence handlers.
> So stonith is a hard requirement even when a simple reboot is done?
> The docs is mentioning following:
> "The ocf:linbit:drbd OCF resource agent provides Master/Slave
> capability, allowing Pacemaker to start and monitor the DRBD
> resource on multiple nodes and promoting and demoting as needed. You
> must, however, understand that the drbd RA disconnects and detaches
> all DRBD resources it manages on Pacemaker shutdown, and also upon
> enabling standby mode for a node."
> http://drbd.linbit.com/users-guide-8.4/s-pacemaker-crm-drbd-backed-service.html
> So why demoting does not work when a reboot is done?
> When I do a simple crm node standby; sleep 30; crm node online
> everything is fine.
> best regards
>  Waldemar

It's a hard requirement, period. Without it, debugging problems is a
waste of time because the cluster enters an undefined state. Fix
stonith, see if the issue remains, and if so, let us know.

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