[wellylug] High load averages but no apparent cause

[David Harrison]

Yes that could be a very real possibility.

A replacement server is being shipped up tomorrow, so by mid-next week it
should be back here in Wellington where it can be better examined...


On Thu, Mar 25, 2010 at 10:42 AM, Daniel Reurich <daniel at centurion.net.nz>wrote:

> Power supply not coping anymore (under spec'd) or mainboard capacitors
> popped is my guess.
>
>
>
> On Thu, 2010-03-25 at 07:51 +1300, David Harrison wrote:
> > 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
> >         > To Leave:
> >          http://lists.wellylug.org.nz/mailman/listinfo/wellylug
> >
> >
> >
> >         --
> >         Daniel Reurich.
> >
> >         Centurion Computer Technology (2005) Ltd
> >         Mobile 021 797 722
> >
> >
> >
> >
> >         --
> >
> >
> >         Wellington Linux Users Group Mailing List:
> >         wellylug at lists.wellylug.org.nz
> >         To Leave:
> >          http://lists.wellylug.org.nz/mailman/listinfo/wellylug
> >
> >
> >
> > --
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>
>
>
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