> And make sure the daemons are running in the real time scheduler class.
> There exists a state, commomly refered to as "split brain", where the
> nodes of a cluster "think" the other one is down, which is not the fact.
> Reason for this may be that the load is so high, that the heartbeat
> daemon is not scheduled in time to answer the requests (it happened to
> me with a commercial product). then both nodes mount the filesystem.
> Usually the inital fsck (or log replay or whatever) is enough to destroy
> the filesystem beyond repair. But all these things are in no way LVM
> specific, so it works.
Or don't, and buy a power supply that you can control from serial, and
do so -- STONITH, it's called -- Shoot The Other Node In The Head. Once
the power is off, there is no danger of fsck'ing...
It's a rather elegant way to solve that problem, IMHO.
We're going that route.
--
"The most valuable piece of equipment in the darkroom
is the trash can."
--Ansel Adams
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