Managing NFS and KRPC Kernel Configurations in HP-UX 11i v2 (November 2013)

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more than one TCP connection is used to communicate with the NFS server. This tunable is referred to
as clnt_max_conns in the Solaris environment.
Tested values
Default: 1
Min: 1
Max: 10
Note: If the tunable is set to a value greater than 10
connections, an informational warning is issued at runtime.
This value is outside the tested limits.
Restrictions on changing
The rpc_clnt_max_conns tunable is dynamic. System reboot is not required to activate a change made
to this tunable.
Modifying the value
In most cases, a single TCP connection adequately handles the load of a single client, even for
multiple filesystems mounted from the same server.
In some cases, the client can benefit from opening multiple TCP connections to the NFS server. For
example, if both the client and the server are using a 4-port APA trunk and mount filesystems across
the APA trunk, they might experience better performance and overall throughput if the
rpc_clnt_max_conns tunable is increased to 4, thus matching the number of physical ports in the APA
trunk.
Increasing the tunable can result in the server using more kernel threads to handle the NFS/TCP
requests. In that case, the NFS server’s kernel may need to be tuned by modifying the nkthread and
max_thread_proc tunables.