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Novell SLES10 RC3

Submitted by mike on Tue, 2006-06-27 22:41
Novell has put up the SLES10 RC3 pre-release. The big changes with this new release listed by Novell are: * integration with Xen * AppArmor * integrated system management * fully integrated, high-availability storage (Linux MPIO, OCFS2) I especially like the ease-of-use of the Xen domainU installation in YaST. Even though it did not work yet when I last tried it with OpenSUSE 10.2 Alpha, but this seems to have been fixed by now. Another shortfall of the Xen installation is that only loopback filesystems could be used to install to. I usually keep my Xen hosts in LVM. Hopefully, LVM wi

Kernel-upgrade with OCFS2-1.2.1 for SLES9

Submitted by mike on Fri, 2006-05-26 18:45

Novell have released a Kernel upgrade for SLES9 (2.6.5-7.257) that - among lots of fixes - comes with a new version of OCFS2 (OCFS2-1.2.1), released on April 24. There are no new features as compared to the version shipped with the SLES9 SP3 Kernel (2.6.5-7.244).

Use deadline I/O scheduler instead of cfq with OCFS2 on SLES9

Submitted by mike on Fri, 2006-04-14 12:18

The cfq i/o scheduler allows processes to temporarily starve other processes. This leads to the self-fencing of cluster nodes when a cluster filesystem like OCFS2 is used. OCFS2 will self-fence a node if its heartbeat is unable to perform i/o for one minute. This applies to both SLES9 and RH4. The heartbeat timeout is set in /etc/sysconfig/o2cb:HEARTBEAT_THRESHOLD.

To use deadline elevator instead of cfq, add the following to your GRUB configuration:

Add elevator=deadline instead of cfq to /boot/grub/menu.lst

OCFS2 root filesystem over TCP in Xen ?

Submitted by mike on Sun, 2006-04-09 23:09

There's a thread over at ocfs2-devel and ocfs2-users about adding support for TCP to OCFS2. One of the posters has got OCFS2 as root file system working, but over IP. If OCFS2 heartbeat would run over plain TCP, the IP stack would not need to be loaded for the root fs to become available. This opens up some nice possibilities. One downside of using TCP would be the limitation of the heartbeat traffic to one network segment. However, OCFS2 heartbeat is best run over back-2-back links anyways.

Related links

  • [ocfs2-users@oss.oracle.com] ocfs2 root filesystem

Oracle Cluster Filesystem OCFS2

OCFS2 is Oracle's Open Source cluster filesystem. Check out the project site at oss.oracle.com for more information.

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