Re: 2.6.6-mm5

Jens Axboe
2004-05-26T12:49:55Z

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