Message-Id: <200612152215.23629.rjw@sisk.pl>
Date:	Fri, 15 Dec 2006 22:15:23 +0100
From:	"Rafael J. Wysocki" <rjw@...k.pl>
To:	Neil Brown <neilb@...e.de>
Cc:	Jurriaan <thunder7@...all.nl>, Andrew Morton <akpm@...l.org>,
	linux-kernel@...r.kernel.org, linux-raid@...r.kernel.org
Subject: Re: sata badness in 2.6.20-rc1? [Was: Re: md patches in -mm]

I don't think it's in -rc1, please see below.

On Friday, 15 December 2006 21:50, Neil Brown wrote:
> On Friday December 15, thunder7@...all.nl wrote:
> > From: Neil Brown <neilb@...e.de>
> > Date: Wed, Dec 06, 2006 at 06:20:57PM +1100
> > > i.e. current -mm is good for 2.6.20 (though I have a few other little
> > > things I'll be sending in soon, they aren't related to the raid6
> > > problem).
> > > 
> > 2.6.20-rc1-mm1 doesn't boot on my box, due to the fact that e2fsck gives
> > 
> > Buffer I/O error on device /dev/md0, logical block 0
> > 
> 
> But before that....
> > raid5: device sdh1 operational as raid disk 1
> > raid5: device sdg1 operational as raid disk 0
> > raid5: device sdf1 operational as raid disk 5
> > raid5: device sde1 operational as raid disk 6
> > raid5: device sdd1 operational as raid disk 7
> > raid5: device sdc1 operational as raid disk 3
> > raid5: device sdb1 operational as raid disk 2
> > raid5: device sda1 operational as raid disk 4
> > raid5: allocated 8462kB for md0
> > raid5: raid level 6 set md0 active with 8 out of 8 devices, algorithm 2
> > RAID5 conf printout:
> >  --- rd:8 wd:8
> >  disk 0, o:1, dev:sdg1
> >  disk 1, o:1, dev:sdh1
> >  disk 2, o:1, dev:sdb1
> >  disk 3, o:1, dev:sdc1
> >  disk 4, o:1, dev:sda1
> >  disk 5, o:1, dev:sdf1
> >  disk 6, o:1, dev:sde1
> >  disk 7, o:1, dev:sdd1
> > md0: bitmap initialized from disk: read 15/15 pages, set 1 bits, status: 0
> > created bitmap (233 pages) for device md0
> > md: super_written gets error=-5, uptodate=0
> > raid5: Disk failure on sde1, disabling device. Operation continuing on 7 devices
> > md: super_written gets error=-5, uptodate=0
> > raid5: Disk failure on sdg1, disabling device. Operation continuing on 6 devices
> > md: super_written gets error=-5, uptodate=0
> > raid5: Disk failure on sdf1, disabling device. Operation continuing on 5 devices
> > md: super_written gets error=-5, uptodate=0
> > raid5: Disk failure on sdc1, disabling device. Operation continuing on 4 devices
> > md: super_written gets error=-5, uptodate=0
> > raid5: Disk failure on sdb1, disabling device. Operation continuing on 3 devices
> > md: super_written gets error=-5, uptodate=0
> > raid5: Disk failure on sdh1, disabling device. Operation continuing on 2 devices
> > md: super_written gets error=-5, uptodate=0
> > raid5: Disk failure on sdd1, disabling device. Operation continuing on 1 devices
> > md: super_written gets error=-5, uptodate=0
> > raid5: Disk failure on sda1, disabling device. Operation continuing on 0 devices
> 
> Oh dear, that array isn't much good any more.!
> That is the second report I have had of this with sata drives.  This
> was raid456, the other was raid1.  Two different sata drivers are
> involved (sata_nv in this case, sata_uli in the other case).

The other box is mine and it works just fine with 2.6.20-rc1.

> I think something bad happened in sata land just recently.

Yup.  Please see, for example:

http://marc.theaimsgroup.com/?l=linux-kernel&m=116621656432500&w=2

It looks like the breakage is in sata, in the patches that went in after
2.6.19-rc6-mm2 (that one worked for me like charm).

Greetings,
Rafael


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