Re: 2.6.6-mm5

[Jens Axboe]

On Wed, May 26 2004, Anders Gustafsson wrote:
> On Sat, May 22, 2004 at 01:36:36AM -0700, Andrew Morton wrote:
> > 
> > - Implementation of request barriers for IDE and SCSI.  The idea here is
> >   that a filesystem can tag an IO request as a barrier and the disk will not
> >   reorder writes across the barrier.  It provides additional integrity
> >   guarantees for the journalling filesystems.  The feature is enabled for
> >   reiserfs and ext3.
> 
> I get: this error message when using barriers on a scsi disk:
> 
> lost page write due to I/O error on sdb1
> JBD: barrier-based sync failed on sdb1 - bisabling barriers
> 
> and I don't want them barriers bisabled :)
> 
> ext3 filesystem. reiser also disables barriers.
> 
> I have a "Adaptec AIC-7902 U320 (rev 3)" SCSI controller and the disk is a
> SEAGATE ST373307LW.

But they need to be bisabled, since -o barrier doesn't work on SCSI yet.
Only non-data tagged flushes are supported, those from
blkdev_issue_flush().

-- 
Jens Axboe

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