Managing NFS and KRPC Kernel Configurations in HP-UX 11i v3 (762807-001, March 2014)

threshold because of change in the filecache_max parameter. System reboot is not required to
activate a change made to this tunable.
Modifying the Value
Enable this tunable to force the NFS client to use only limited UFC file cache which is controlled by
nfs_ufc_threshold_percentage tunable. HP recommends enabling this tunable if you configure very less
value for UFC filecache_max and also have loopback mount points.
2.1.44 nfs3_ufc_threshold_percentage
Description
The nfs3_ufc_threshold_percentage tunable controls the amount of UFC file cache that can be
consumed by the NFS client at any given point of time. This tunable will be effective only when the
nfs_enable_ufc_threshold tunable is enabled.
Tested Values
Default: 50% (NFS client’s UFC usage limited to 50% of filecache_max at any given point)
Min: 40%
Max: 70% (Maximum percentage of filecache_max that NFS client can use at any given point of
time)
Note:.
This tunable is implemented only for NFS v3 mounts.
This tunable is applicable only for B11.31.13 and
B11.31.14 ONC versions. From ONC B11.31.15 version
onwards this tunable is replaced by new tunable
nfs_ufc_threshold_percentage.
Please refer tunable nfs_ufc_threshold_percentage
.
Restrictions on Changing
The nfs3_ufc_threshold_percentage tunable is static. All NFS mount points must be unmounted before
making any change to this tunable. System reboot is not required to activate a change made to this
tunable.
Modifying the Value
Based on the UFC file cache settings and workload, users can change this tunable to enable the NFS
client to use a limited UFC file cache across all NFS v3 mount points.