[Pkg-iscsi-maintainers] Bug#629442: Bug#629442: iscsitarget: ietd gives "iscsi_trgt: Abort Task" errors on high disk load and iscsi connections are dropped

[Massimiliano Ferrero]

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

-- 

Massimiliano Ferrero
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