[DRBD-user] Re: filesystem corruptions

Philipp Reisner philipp.reisner at linbit.com
Tue Oct 25 10:53:38 CEST 2005


Am Freitag, 21. Oktober 2005 10:44 schrieb Eugene Crosser:
> Philipp Reisner wrote:
> >>Judging from people's posts and my own experience, I *think* that the
> >>problem does not show on SCSI, only on on-board SATA.
> >
> > [...]
> >
> >>Kernel 2.6.11.12 + bio_clone() fix, SMP
> >>Marvell MV88SX6081 8-port SATA II PCI-X Controller (rev 03),
> >>mvsata340 driver
> >>drbd 0.7.13 (SVN Revision: 1942)
> >>md3 : active raid5 sdf3[5] sde3[4] sdd3[3] sdc3[2] sdb3[1] sda3[0]
> >
> > [...]
> >
> >>  on snfs1 {
> >>    device /dev/drbd0;
> >>    disk /dev/md3;
> >>    address 10.0.0.2:7788;
> >>    meta-disk  internal;
> >>  }
> >
> > My config here is
> > 2.6.13, SMP, 4CPUs
> > Currently the disk is on the compaq controller /dev/ida/c0d0...
> > No software raid.
> >
> > I had no 24h of a wbtest on top of a Primary/SyncSource DRBD
> > with ext3 running. Nothing regarding ext3 in the syslog so far.
>
> I think (not 100% sure) that we did run wbtest on our SATA system
> (without production load), and it did not trigger the problem.
>

Hi Eugene,

I just finished an other test 24h run, this time with about 90000 files
worth about 20GB of data. This time I had the primary/syncsource
on top of a *real* SCSI driver the Symbios 875 controller.

SCSI storage controller: LSI Logic / Symbios Logic 53c875 (rev 14)

I think that a SCSI controller like this is reasonably close to
an SATA device, since the SATA drivers in Linux use the SCSI
infrastructure. I.e. they use the same way to call their IO-
completion handlers etc...

I can not reproduce the issue here, no messages from ext3 nor from
wbtest.

I used:
wbtest -m 4096 -M 4194304 -p 0 -r 10000 -c 3 -l /root/vlog -d .

Eugene, in case you find a way to trigger the corruption, that I can
reproduce here, please let me know...

Open questions:  
  Might it be related to the md driver ?
  To the combination of md/drbd ?

-Phil
-- 
: Dipl-Ing Philipp Reisner                      Tel +43-1-8178292-50 :
: LINBIT Information Technologies GmbH          Fax +43-1-8178292-82 :
: Schönbrunnerstr 244, 1120 Vienna, Austria    http://www.linbit.com :



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