Managing NFS and KRPC Kernel Configurations in HP-UX 11i v2 (Oct 2008)

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. For more information on this tunable, see
nfs3_do_symlink_cache.
Tested Values
Default: 0 (Symbolic link cache is disabled)
Min: 0
Max: 1 (Symbolic link cache is enabled)
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.
2.1.12 nfs2_dynamic
Description
The nfs2_dynamic tunable controls the dynamic retransmission feature for NFSv2 mounted filesystems.
The dynamic retransmission feature is designed to reduce NFS retransmissions by monitoring server
response time and adjusting read and write transfer sizes on NFSv2 mounted filesystems using
connectionless transports such as UDP.
The nfs3_dynamic tunable controls the dynamic retransmission feature for NFSv3 mounted filesystems.
For more information, see
nfs3_dynamic.
Tested Values
Default: 1 (Dynamic retransmission is enabled)
Min: 0 (Dynamic retransmission is disabled)
Max: 1
Restrictions on Changing
The nfs2_dynamic tunable is dynamic. System reboot is not required to activate changes made to this
tunable. However, the dynamic retransmission feature is set per filesystem at mount time. You must
unmount and re-mount each filesystem after changing this tunable. Only NFSv2 mount points are
affected when you change the value of this tunable.
Modifying the Value
In congested networks, sending smaller sized NFS data packets can help if the network is dropping
larger data packets. Enabling this tunable enables you to adjust the read and write transfer sizes for
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