Hello,
I have some questions regarding 2 node setups and quorum.
The HA website lists the quorum server as a mechanism to provide two
node cluster quorum. However I have a test setup with two nodes only. An
alternative to fully automated cluster failover is manual failover
confirmation. That is an option for wide area 2 node clusters too.
From looking thoug the code I think there is lots to come (tiebreaker)
and there are already four plugins for membership (from what I
understand in /usr/lib/heartbeat/plugins/quorum). Also theres a
tiebeaker already (/usr/lib/heartbeat/plugins/tiebreaker).
Now how could I set up a 2 node cluster with manual failover confirmation ?
Well I think there are many possibilities
1) Using a custom resource agent that waits for confirmation
2) Writing a tiebreaker plugin and setting the quorum plugin to "majority"
3) Writing a quorum plugin
4) Modify the existing quorumd to give quorum only after admin confirmation
5) Write a own quorum daemon
What's a practical aproach ? Anyone using such a setup ?
Is the tiebreaker plugin already impleneted in the cluster ? I did not
find places were it is referenced (2.1.3)
Are the times the quorum and tiebreaker plugin take calculated in the
transition timout ? I mean if there would be a manual failover
confirmation plugin, a admin would probably need some minutes to hours
to confirm a failover. Would this be a problem for the cluster timing
(transition timeout) ?
And one more - what happens if a STONITH fails ? does the failover
continue ?
Regards,
Robert
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