On Fri, 2008-06-20 at 16:01 +0200, Bernd Schubert wrote: > > We do it for several lustre installations and it works fine.
Have you done any "intensive" failover testing of it? I'm thinking something along the lines of our Hendrix/CMD test 11 or 17. In those tests we had to survive a constant stream of failovers at something like 3 or 5 minute intervals for 24 hours. So yes, a hundred or two failovers in a row and no application (i.e. userspace) errors. Seeing as we know Lustre can do it (we completed that contract) I'd be more interested of course in seeing DRBD survive that kind of torture. I'm not sure how (long) DRBD takes to come back into fully mirrored status when one node is powered off though. If it's a long time, that in itself is an exposure to failure that shared storage doesn't suffer. b.
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