[CentOS-devel] Back-port md raid1/10 BIO_RW_SYNC patch for DRBD

Johnny Hughes mailing-lists at hughesjr.com
Wed Feb 28 15:07:31 UTC 2007


On Wed, 2007-02-28 at 02:08 -0600, Johnny Hughes wrote:
> On Tue, 2007-02-27 at 21:10 -0500, Ross S. W. Walker wrote:
> > > -----Original Message-----
> > > From: centos-devel-bounces at centos.org 
> > > [mailto:centos-devel-bounces at centos.org] On Behalf Of Ross S. 
> > > W. Walker
> > > Sent: Sunday, February 25, 2007 12:24 PM
> > > To: centos-devel at centos.org
> > > Subject: [CentOS-devel] Back-port md raid1/10 BIO_RW_SYNC 
> > > patch for DRBD
> > > 
> > > 
> > > Attention CentOS Developers,
> > > 
> > > Here is a back-port of Lars Ellenberg's md raid1/10 patch from 2.6.19+
> > > to 2.6.9. It seems the md raid1 and raid10 drivers were stripping the
> > > BIO_RW_SYNC flags on requests which caused a severe 
> > > performance penalty
> > > for DRBD when writing it's meta-data to these volumes.
> > > 
> > > The patch is attached as well as inlined:
> > 
> > No comments?
> 
> I just put it in the new CentOSPlus kernel (that I am currently
> testing).
> 
> Should be out later today (if it works).


OK ... the released CentOS-Plus kernel (2.6.9-42.0.10.plus.c4) has that
patch installed on x86_64 and i386 ... and I did install it and test
with DRBD.  The systems it is on are running OK.

Thanks,
Johnny Hughes
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