Le Wed, 17 Nov 2010 11:43:12 +0100
Piotr Kandziora <piotr.kandziora@xxxxxxxxxx> écrivait:
> - debian based distribution with a lot of modification,
> - architecture x86_64,
So this isn't a case of 32 bits rsync running out of memory (case
seen...)
> - xfs tools version 2.10.1
> - mount options for this LV:
> rw,noatime,nodiratime,attr2,nobarrier,usrquota,prjquota,grpquota
> - NFS share is exported with following options:
> rw,no_root_squash,insecure,insecure_locks,async,anonuid=65534,anongid=65534,subtree_check
>
> >> Unfortunately our system is freezing unexpectedly without reason.
> >>
> > What are the symptoms ? does the whole system freeze up? Or does it
> > crash with kernel panic, or otherwise "Oops" messages?
> >
>
> Symptoms are different. One time we've got a few oom-killers:
This is abnormal, but kernel disk cache shouldn't interfere anyway.
> [kern.warning] kernel: load_average invoked oom-killer:
> [kern.warning] kernel: 3dm2 invoked oom-killer: gfp_mask=0xd0,
> 2010/11/11 10:56:21|Pid: 4324, comm: nfsd Not tainted
> Filesystem "dm-37": xfs_log_force: error 5 returned.
This looks like an IO error, as Eric Sandeen said.
> We've checked temperature on each disk using LSI/3ware CLI (tw_cli)
> and average is 35C.
It's the card itself that's overheating and fails, not the disks. I had
to replace quite a number of these on field after a year of use or two;
they work well for a while, but crash when heavily sollicited.
However this should cause a complete IO freeze. Did you try to run
something like "tw_cli alarms" right after the failure?
If tw_cli can't communicate with the controller anymore, than that's a
case of a fried card.
> This problem occurred two times in the past, we repaired fs using
> xfs_repair (and it showed errors). We simulated it using dumping
> cache yesterday ...
I don't understand how or why dumping cache would cause the system to
fail... except that it may augment actual disk IOs.
--
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