linux-kernel - Re: 2.6.19-mm1 (md/raid1 randomly drops partitions

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Message-Id: <200612131251.20256.rjw@sisk.pl>
Date:	Wed, 13 Dec 2006 12:51:19 +0100
From:	"Rafael J. Wysocki" <rjw@...k.pl>
To:	Neil Brown <neilb@...e.de>
Cc:	Andrew Morton <akpm@...l.org>, linux-kernel@...r.kernel.org
Subject: Re: 2.6.19-mm1 (md/raid1 randomly drops partitions - possible sata_uli problem)

On Wednesday, 13 December 2006 01:53, Neil Brown wrote:
> On Tuesday December 12, rjw@...k.pl wrote:
> > > 
> > > So when md writes to write out the superblock, to gets EIO... Odd that
> > > you aren't getting errors for normal writes.
> > > 
> > > What devices are the md/raid1 built on?
> > 
> > Sata drives, on sata_uli.
> > 
> > > > 
> > > > I'll try to reproduce it tomorrow and collect some more information.
> > > 
> > > Thanks.  More information is definitely better than less, so send over
> > > anything you can find.
> > 
> > Okay, seems to be readily reproducible, dmesg output from the failing kernel
> > attached.
> 
> Weird.  You are getting silent write errors...
> 
> Can you write to these drives are all? e.g.
> 
>   dd if=/dev/sdb3 of=/tmp/tmp count=1
>   dd if=/tmp/tmp of=/dev/sdb3 oflag=direct
> 
> (hopefully 'direct' will cause write errors to be passed up).

Unfortunately I have no access to the machine right now.

> I really think this looks like a sata problem, not an md problem.

That's possible, but everything except for the md RAID seems to work.  Strange.

I think I'll wait until the next -mm is out and check if the problem goes away. ;-)

Greetings,
Rafael


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