[wellylug] High load averages but no apparent cause

[David Harrison]

No, but now that you say that if the system is unable to write to the RAID5
which contains the log file would this even happen?

e.g. /var is the problematic RAID5 partition and when it locks up it takes
out one or more of the physical disks.

An interesting observation is that when the problem occurs it either locks
up both sda & sdb, or sdc by itself.
I am guessing that this is because sda & sdb are on the same channel, so
either the channel itself is going or one of the disks is which is taking
the other with it.


David



On Thu, Mar 25, 2010 at 12:14 AM, Daniel Reurich <daniel at centurion.net.nz>wrote:

> Does anything show up in the syslog or dmesg that indicates sata i/o
> port resets or anything like that??
>
> Daniel Reurich
>
> On Wed, 2010-03-24 at 20:53 +1300, David Harrison wrote:
> > On Wed, Mar 24, 2010 at 6:36 PM, Daniel Pittman <daniel at rimspace.net>
> > wrote:
> >         David Harrison <david.harrison at stress-free.co.nz> writes:
> >
> >
> >         > I will try the deadline scheduler tonight and see if that
> >         makes a
> >         > difference.
> >
> >
> >         You should be able to make the change at run-time, through
> >         sysfs, I believe.
> >         It is a property of the hardware devices, IIRC, in sysfs.
> >
> >
> >
> >
> > I tried out a few of the schedulers and none of them helped the
> > problem.
> > If anything I'd have to say it got worse.
> >
> >
> > As a final test I have switched to the kernel that was installed
> > originally by Ubuntu (2.6.24-24-server).
> > The problem still exists and I know for sure it didn't when things
> > were first setup.
> > - There's just no way we could have migrated 400gig of data onto the
> > RAID if it was this flakey.
> >
> >
> > Whatever it is is hardware related, and it seems to be getting worse
> > over time...
> >
> >
> >
> >
> > David
> >
> >
> > --
> > Wellington Linux Users Group Mailing List:
> wellylug at lists.wellylug.org.nz
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>
>
> --
> Daniel Reurich.
>
> Centurion Computer Technology (2005) Ltd
> Mobile 021 797 722
>
>
>
>
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