[Pacemaker] Behavior of Corosync+Pacemaker with DRBD primary power loss

[Andrew Martin]

Hello, 

I have a 3 node Pacemaker + Corosync cluster with 2 "real" nodes, node0 and node1, running a DRBD resource (single-primary) and the 3rd node in standby acting as a quorum node. If node0 were running the DRBD resource, and thus is DRBD primary, and its power supply fails, will the DRBD resource be promoted to primary on node1? 

If I simply cut the DRBD replication link, node1 reports the following state: 
Role: 
Secondary/Unknown 

Disk State: 
UpToDate/DUnknown 

Connection State: 
WFConnection 


I cannot manually promote the DRBD resource because the peer is not outdated: 
0: State change failed: (-7) Refusing to be Primary while peer is not outdated 
Command 'drbdsetup 0 primary' terminated with exit code 11 

I have configured the CIB-based crm-fence-peer.sh utility in my drbd.conf 
fence-peer "/usr/lib/drbd/crm-fence-peer.sh"; 
but I do not believe it would be applicable in this scenario. 

If node0 goes offline like this and doesn't come back (e.g. after a STONITH), does Pacemaker have a way to tell node1 that its peer is outdated and to proceed with promoting the resource to primary? 

Thanks, 

Andrew 
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