problem with software raid1 on 2.6.22.10: check/rebuild hangs

problem with software raid1 on 2.6.22.10: check/rebuild hangs

[Wolfgang Walter]

Hello,

with kernel 2.6.22.10 checking a raid1 or rebuilding ist does not work on one 
of our machines. After a short time the rebuild/check does not make progress 
any more . Processes which then access the filesystems on those raids are 
blocked.

Nothing gets logged. Access to other filesystems works fine.

If we boot 2.6.17.10 (the kernel we used befor upgrading to 2.6.22) the raids 
the check/rebuild is done without any problems.

The filesystems on the raid are exported via nfs.

The machine has 2 xeons with hyperthreading.

Regards,
-- 
Wolfgang Walter
Studentenwerk München
Anstalt des öffentlichen Rechts
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Re: problem with software raid1 on 2.6.22.10: check/rebuild hangs

[Neil Brown]

On Monday December 3, wolfgang.walter@studentenwerk.mhn.de wrote:
> Hello,
> 
> with kernel 2.6.22.10 checking a raid1 or rebuilding ist does not work on one 
> of our machines. After a short time the rebuild/check does not make progress 
> any more . Processes which then access the filesystems on those raids are 
> blocked.
> 
> Nothing gets logged. Access to other filesystems works fine.
> 
> If we boot 2.6.17.10 (the kernel we used befor upgrading to 2.6.22) the raids 
> the check/rebuild is done without any problems.
> 

Sounds like a driver problem.
Your symptoms are completely consistent with a request being submitted
to the underlying device, and that request never completing.

What controller runs your drives for you.  You should probably report
the problem to the relevant maintainer.

Do you compile your own kernels?  Would you be comfortable using "git
bisect" to narrow down exactly which change breaks things?  It should
take more than a dozen or so tests.

NeilBrown

Re: problem with software raid1 on 2.6.22.10: check/rebuild hangs

[Wolfgang Walter]

Am Montag, 3. Dezember 2007 04:00 schrieb Neil Brown:
> On Monday December 3, wolfgang.walter@studentenwerk.mhn.de wrote:
> > Hello,
> >
> > with kernel 2.6.22.10 checking a raid1 or rebuilding ist does not work on
> > one of our machines. After a short time the rebuild/check does not make
> > progress any more . Processes which then access the filesystems on those
> > raids are blocked.
> >
> > Nothing gets logged. Access to other filesystems works fine.
> >
> > If we boot 2.6.17.10 (the kernel we used befor upgrading to 2.6.22) the
> > raids the check/rebuild is done without any problems.
>
> Sounds like a driver problem.
> Your symptoms are completely consistent with a request being submitted
> to the underlying device, and that request never completing.
>
> What controller runs your drives for you.  You should probably report
> the problem to the relevant maintainer.

3ware Inc 9xxx-series SATA-RAID.

There are no problems with normal operation. And when those raids stop to work 
all other disks on the same controller still work.

And I don't see problems when reading from several disk in parallel.

But this doesn't mean its not the driver, of course.

>
> Do you compile your own kernels?

Yes.

> Would you be comfortable using "git 
> bisect" to narrow down exactly which change breaks things?  It should
> take more than a dozen or so tests.

Yes. Its a little bit difficult as I can only test kernels in the night and on 
weekend.

First I have to see how to use git to get the repository and how to do git 
bisect.

>
> NeilBrown

Thanks and regards,
-- 
Wolfgang Walter
Studentenwerk München
Anstalt des öffentlichen Rechts
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