> -----Original Message----- > From: centos-devel-bounces at centos.org > [mailto:centos-devel-bounces at centos.org] On Behalf Of Ross S. > W. Walker > Sent: Thursday, March 01, 2007 12:17 AM > To: The CentOS developers mailing list. > Subject: RE: [CentOS-devel] Back-port md raid1/10 BIO_RW_SYNC > patch for DRBD > > > -----Original Message----- > > From: centos-devel-bounces at centos.org > > [mailto:centos-devel-bounces at centos.org] On Behalf Of Ross S. > > W. Walker > > Sent: Thursday, March 01, 2007 12:03 AM > > To: The CentOS developers mailing list. > > Subject: RE: [CentOS-devel] Back-port md raid1/10 BIO_RW_SYNC > > patch for DRBD > > > > > -----Original Message----- > > > From: centos-devel-bounces at centos.org > > > [mailto:centos-devel-bounces at centos.org] On Behalf Of Ross S. > > > W. Walker > > > Sent: Wednesday, February 28, 2007 11:32 AM > > > To: The CentOS developers mailing list. > > > Subject: RE: [CentOS-devel] Back-port md raid1/10 BIO_RW_SYNC > > > patch for DRBD > > > > > > > -----Original Message----- > > > > From: centos-devel-bounces at centos.org > > > > [mailto:centos-devel-bounces at centos.org] On Behalf Of > > Johnny Hughes > > > > Sent: Wednesday, February 28, 2007 10:08 AM > > > > To: CentOS-Devel > > > > Subject: RE: [CentOS-devel] Back-port md raid1/10 BIO_RW_SYNC > > > > patch for DRBD > > > > > > > > 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. > > > > > > Excellect, I am currently running the patch on my x86_64 plus > > > kernel here > > > with no problems, and I have the OS booting off of RAID1, I > > have the > > > meta-data as a LVM on the OS vg and no problems and a significant > > > improvement with my large DRBD volumes. > > > > > > Lars did review the fixes too and gave them the ok, so it wasn't > > > completely without review. > > > > > > > Ok, I just updated to that kernel, > > kernel-2.6.9-42.0.10.plus.c4, and I do not see the patch in there? > > > > Did it miss the final cut? > > My bad I spoke too soon, it is in there as > linux-2.6.9-raid-bio-rw-sync.patch. > > Sorry, Again, I don't want to be alarmist but... I think there might be a build problem with the latest plus kernel: [root at mfg-nyc-iscsi2 make]# rpm -qa | grep kernel | sort iscsitarget-kernel-smp-0.4.14-98_2.6.9_42.0.8.plus.c4 kernel-doc-2.6.9-42.0.10.plus.c4 kernel-ib-1.0-1 kernel-module-drbd-2.6.9-42.0.3.plus.c4smp-0.7.21-1.c4 kernel-module-drbd-2.6.9-42.0.8.plus.c4smp-0.7.23-1.c4 kernel-smp-2.6.9-42.0.10.EL kernel-smp-2.6.9-42.0.8.plus.c4 kernel-smp-devel-2.6.9-42.0.10.EL kernel-utils-2.4-13.1.83 Looks like the plus kernel dependencies got mixed up... [root at mfg-nyc-iscsi2 make]# ls -l /lib/modules/ total 32 drwxr-xr-x 3 root root 4096 Feb 28 23:45 2.6.9-42.0.10.ELsmp drwxr-xr-x 2 root root 4096 Dec 22 23:13 2.6.9-42.0.3.EL drwxr-xr-x 3 root root 4096 Feb 2 17:31 2.6.9-42.0.3.ELsmp drwxr-xr-x 4 root root 4096 Feb 24 11:13 2.6.9-42.0.3.plus.c4smp drwxr-xr-x 4 root root 4096 Feb 28 23:45 2.6.9-42.0.8.plus.c4smp drwxr-xr-x 2 root root 4096 Dec 22 23:12 2.6.9-42.EL drwxr-xr-x 2 root root 4096 Feb 27 09:53 kabi-4.0-0smp And it's gone and installed the standard kernel. -Ross ______________________________________________________________________ This e-mail, and any attachments thereto, is intended only for use by the addressee(s) named herein and may contain legally privileged and/or confidential information. If you are not the intended recipient of this e-mail, you are hereby notified that any dissemination, distribution or copying of this e-mail, and any attachments thereto, is strictly prohibited. If you have received this e-mail in error, please immediately notify the sender and permanently delete the original and any copy or printout thereof.