Il 11/06/2011 10:41, Ritesh Raj Sarraf ha scritto:
It should be worth a try. Try deadline and see if that helps.
Lately, CFQ had had a lot of improvements. But those might have not made
into the squeeze kernel.
BTW, does this issue happen only on heavy load? Or is it triggered also
on moderate load? I'm sure the moment when this issue occurs, the
machine is completely unresponsive.
No, it happens only on heavy load, the storage server performs also
several other functions other than iscsi target, one of these is
monitoring all the virtual machines with nagios and munin: munin updates
run every 5 minutes with a lot of data written to disk, this has never
been a problem.
The only situation that triggers the problem is while performing an
operation like dd or a file system check that is really i/o intensive on
the storage server.
The second time I experienced the problem I was connected with ssh to
the system during the dd watching the log files: i saw real time the
abort messages and I was able to stop the dd and react to the failure
(restart cluster nodes, check virtual machines, etc.), this just to say
that it was not necessary to restart the iscsi target and that the
system was not unresponsive.
I will update the bug as soon as I can test it on another machine.
Gest regards
Massimiliano
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Massimiliano Ferrero
Midhgard s.r.l.
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10149 - Torino
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fax +39-0117768576
e-mail: m.ferr...@midhgard.it
sito web: http://www.midhgard.it
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