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

On ONCplus B.11.31.14 version, Fix was implemented only for NFSv3 client version only.
To enable this fix on this version, following tunables must be set to the below values:
kctune nfs_enable_write_behind = 1
• kctune nfs_enable_ufc_threshold = 1
• kctune nfs3_ufc_threshold_percentage = 50
NOTE: All NFS v3 filesystems have to be unmounted if there is any change in these tunables
or UFC filecache_max.
Workaround
For ONCplus B.11.31.13 and earlier versions, the workaround is to use the
"forcedirectio" option for the NFS mount.
Problem
When ONCplus B.11.31.12 is operating in the SRP environment, if the srp -stop command
is executed while there are active NFS mount points present in the SRP environment, it may
hang and a message similar to the following will be logged in the /var/adm/syslog/
syslog.log file:
vmunix: WARNING: SRP 13 shutdown called with 1 active NFS mounts.
Waiting for unmount to complete.
Cause
When the command is executed to shut down the SRP daemon, it may initiate the NFS client
shutdown while there are active NFS mount points present in the SRP environment. Due to
this, the srp -stop command may hang while waiting for the active NFS filesystems to
unmount.
Workaround
• Before issuing the command, it is recommended to verify whether the NFS mount point
in the SRP environment is active, by executing the fuser -c command on the NFS mount
point from the global view of SRP.
# fuser -c /var/hpsrp/srp01/opt/nfstest
where:
/var/hpsrp/srp01/opt/nfstest is an NFS mount point under the SRP environment
srp01
This command displays the process ids (PIDs) of the active processes on the NFS mount
point.
/var/hpsrp/srp01/opt/nfstest: 11352c
where:
11352 is the PID of the active process on the NFS mount point
If there are no active processes on the NFS mount point, then execute the command.
Otherwise, wait until there are no active processes.
• If the srp -stop command has already been executed and it hangs, force unmount all
the NFS filesystems under the SRP instance which is being shutdown.
# umount -f /var/hpsrp/srp01/opt/nfstest
This unblocks the srp -stop command and allows it to complete the operation.
20 ONCplus B.11.31.15