[Linux-cluster] qdiskd in heuristics mode only?

[Gunther Schlegel]

Hi,

is there any way to prevent fencing if the qdisk quorum partition can't 
be accessed? (yes, that does make sense!)

Scenario is like this:

- 2 node cluster, RHEL6.2, internal data storage (mysql 
multi-master-replication, no GFS involved)
- qdiskd is in place for two reasons:
   1) I need to run some heuristics
   2) to gather quorum if only one node starts up.
- quorum partition is on iSCSI SAN
- SAN storage is not required for the cluster services to operate at all 
(left aside it should work at node startup. But if the iscsi link goes 
down later on there is no need to actually fence a node as long as the 
network cluster communication between these two nodes is fine).

SAN firmware upgrades interrupt the iSCSI storage for about 40 seconds 
(multipathing et al is properly set up and working fine, SAN controller 
failover just takes that long). To mitigate that I need to set quite big 
totem consensus timeouts. Do not like that, but ok.

But the qdiskd keeps on fencing the nodes as soon as quorum partition 
access is restored. Is there any hidden setting to prevent that?

best regards, Gunther

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Gunther Schlegel
Head of IT Infrastructure




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