ONCplus B.11.31.15 Release Notes (5992-5685, September 2012)

WARNING!
1. Problem
There is a possibility for an NFS client to experience a system hang if you revert to one of the
below ONCplus versions:
• ONCplus B.11.31.09
• ONCplus B.11.31.09.01
• ONCplus B.11.31.09.02
Cause
The NFS client could hang under below conditions/configurations:
• Severe file cache memory pressure due to low file cache configuration.
For example, filecache_min = filecache_max =1%
• When the nfs3_max_threads tunable is set to “0”.
Workaround
The fix for this issue is available in ONCplus B.11.31.10, released in September 2010.
Following are the possible workarounds to handle this issue,
NOTE: All these workarounds must be considered to ensure the system hang does not occur.
Reboot the system, after applying all the workarounds.
• Set the below values to the NFS internal variables:
# echo "async_commit_wait_multipler ?W 0xF4240" |
adb -w -o /stand/vmunix /dev/kmem
# echo "nfs_awcount_multipler ?W 0x2" | adb -w -o
/stand/vmunix /dev/kmem
• Increase the value of the nfs3_max_threads tunable to least 8 using the following
command:
# kctune nfs3_max_threads=default
• If you are doing a manual un-mount, ensure that no application is accessing the NFS
mount point at the time of manual un-mount.
For example, if /mnt/nfs is an NFS mounted directory, use the following command to
verify and un-mount the directory.
# fuser –c /mnt/nfs
• If you are using AutoFS to un-mount an NFS file system, then disable automatic un-mount
by setting a high time out value.
For example, set AUTOMOUNT_TIMEOUT to 99999999 in the /etc/default/autofs
file.
2. The fix for QXCR1000898226 will not be available when:
• Upgrading to ONCplus B.11.31.07.01 from ONCplus B.11.31.07
• Installing HP-UX 11i v3 September 2009 release on a system with ONCplus B.11.31.07
HP recommends you to install ONCplus B.11.31.08 September 2009 or later version to get
the fix for QXCR1000898226.
16 ONCplus B.11.31.15