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

Johnny Hughes mailing-lists at hughesjr.com
Wed Feb 28 08:08:01 UTC 2007


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).

Thanks,
Johnny Hughes
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