HP Tru64 UNIX and TruCluster Server Version 5.1.B-4 Patch Summary and Release Notes (13156)

Note:
In rare cases, the warning message will be accompanied by a system panic. This will occur if CFS
error handling is unable to successfully unmount the underlying physical file system. If this
occurs, the console will direct you to use cfsmgr to unmount the domain on one of the remaining
nodes prior to rebooting the member.
This action will prevent the rebooted member from attempting to failover-mount the file system
and will minimize access to the domain. Prior to remounting the file system, it is advisable that
the domain be sanity-checked using the steps given above.
4.1.15 Tunable Attribute May Help Performance Problem
The tunable attribute cfs_clone_noccr, included in this patch kit , may correct a problem in
which cluster fileset writes that occur simultaneously with reads of the fileset's clone on a cluster
client (for example, during a backup) may result in performance degradation. This occurs most
often when the clone file being read consists of many thousands of extents (for example, 20,000
or more).
If a degradation during cluster clone reads is noticeable (for example, the clone read appears to
be hanging and requires a long time to complete), set the value of cfs_clone_noccr to 1 on
the server of the given fileset. This sysconfig tunable attribute is set to 0 by default and should
be changed only when the degradation is noticeable.
Note that all filesets with clones that are served by the node on which the attribute is set will
also see this change. It may be advisable (though not required) to have those filesets whose clone
files have fewer extents be served by a different node during the time the tunable attribute is set.
4.1.16 AlphaServer ES47 or AlphaServer GS1280 Hangs When Added to Cluster
If after running clu_add_member to add an AlphaServer ES47 or AlphaServer GS1280 as a
member of a TruCluster the AlphaServer hangs during its first boot, try rebooting it with the
original V5.1B generic cluster kernel, clu_genvmunix.
Use the following instructions to extract and copy the V5.1B cluster genvmunix from your
original Tru64 UNIX kit to your AlphaServer ES47 or AlphaServer GS1280 system. In these
instructions, the AlphaServer ES47 or AlphaServer GS1280 is designated as member 5. Substitute
the appropriate member number for your cluster.
1. Insert the Tru64 UNIX Associated Products Disk 2 into the CD-ROM drive of an active
member.
2. Mount the CD-ROM to /mnt. For example:
# mount -r /dev/disk/cdrom0c /mnt
3. Mount the boot disk of the AlphaServer ES47 or AlphaServer GS1280 on its specific mount
point; for example:
# mount root5_domain#root /cluster/members/member5/boot_partition
4. Extract the original clu_genvmunix from the CD-ROM and copy it to the boot disk of the
AlphaServer ES47 or AlphaServer GS1280 member.
# zcat < TCRBASE540 | ( cd /cluster/admin/tmp; \
tar -xf - ./usr/opt/TruCluster/clu_genvmunix)
# cp /cluster/admin/tmp/usr/opt/TruCluster/clu_genvmunix \
/cluster/members/member?/boot_partition/genvmunix
# rm /cluster/admin/tmp/usr/opt/TruCluster/clu_genvmunix
5. Unmount the CD-ROM and the boot disk:
4.1 Release Notes 155