HP Tru64 UNIX and TruCluster Server Version 5.1B-5 Patch Summary and Release Notes (March 2009)

Domain or filesystem name = /mnt
Server Status : Not Served
If this occurs, we recommend that you immediately do the following:
1. Use the following command to unmount the filesystem:
# cfsmgr -u -p [mountpoint]
2. If other mounted filesets exist in the same domain, unmount them (they should
also be in the "Not Served" state):
# cfsmgr -u -d [domain]
For steps on checking an AdvFS domain, see the AdvFS Administration Guide,
Section 6.3.1, steps 3-7.
3. Run diagnostics on the domain prior to remounting its file systems.
To verify the domain, you can use the AdvFS verify utility or the fixfdmn
utility. If using fixfdmn, we recommend first running it with the -n option to
see what errors are found prior to allowing fixfdmnn to fix them.
Once you have successfully verified the domain, remounting the domain's file systems
in the cluster should succeed.
If the domain cannot be immediately verified, we recommend that you do not remount
the original fileset until this can be done.
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.
4.2.15 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 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.
214 TruCluster Server Patches