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

Note: If the tunable is set to a value less than 10 tenths of a
second or greater than 36000 tenths of a second, an
informational warning is issued at runtime. These values are
outside the tested limits.
Restrictions on Changing
The nfs2_cots_timeo tunable is dynamic. System reboot is not required to activate changes made to
this tunable. Any change made to the value of the tunable is effective immediately. However, the
timeout duration is set per filesystem at mount time. The system administrator must unmount and re-
mount each filesystem after changing this tunable. Only NFSv2 mount points are affected by
changing the value of the nfs2_cots_timeo tunable.
Modifying the Value
If you are experiencing a large number of timeouts on connection-oriented NFSv2 filesystems,
increase the value of this tunable. However, a large number of connection-oriented timeouts can be
an indication of networking hardware or software problems.
2.1.11 nfs2_do_symlink_cache
Description
The nfs2_do_symlink_cache tunable caches the contents of symbolic links in NFSv2 mounted
filesystems. If the server changes the contents of a symbolic link, and if either the time stamps are not
updated or the granularity of the time stamp is too large, then the changes become visible to the client
after a long time interval.
The nfs3_do_symlink_cache tunable caches the contents of symbolic links in NFSv3 mounted
filesystems. The nfs4_do_symlink_cache tunable caches the contents of symbolic links in NFSv4
mounted filesystems. For more information on these tunables, see:
• nfs3_do_symlink_cache
• nfs4_do_symlink_cache
Tested Values
Default: 1 (Symbolic link cache is enabled)
Min: 0 (Symbolic link cache is disabled)
Max: 1
Restrictions on Changing
The nfs2_do_symlink_cache tunable is dynamic. System reboot is not required to activate changes
made to this tunable. Only NFSv2 mount points are affected by changing the value of the
nfs2_do_symlink_cache tunable.
Modifying the Value
Enable this tunable to cache the contents of symbolic links. Because the client uses the cached version,
changes made to the contents of the symbolic link file are not immediately visible to applications
running on the client.
To make changes made to the symbolic link file immediately visible to applications on the client,
disable the tunable. Disabling the tunable can result in more over-the-wire requests from the client if
filesystems are mounted with NFSv2 and contain symbolic links.