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[Linux-cluster] qdiskd in heuristics mode only?



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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