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

2.3 KRPC Client Tunables
Table 2.3-1 lists the KRPC client tunables. The last column specifies which ONCplus version first
introduced the tunable.
Table 2.3-1 KRPC Client Tunables
Kctune Tunable Name Range Default
Value
Units ONCplus
Version
rpc_clnt_idle_timeout 0 to 600000 300000 Milliseconds B.11.31_LR
rpc_clnt_max_conns 1 to 10 1 Connections B.11.31_LR
rpc_clnt_udpresvports 0 to 256 0 Ports B.11.31.03
2.3.1 rpc_clnt_idle_timeout
Description
The rpc_clnt_idle_timeout tunable controls the time interval, in milliseconds, that a TCP connection
between the server and client may remain idle before it is forcibly closed by the client system.
Tested Values
Default: 300000 (5 minutes)
Min: 1000 (1 second)
Max: 600000 (10 minutes)
Note: If the tunable is set to a value less than 1000
milliseconds or greater than 600000 milliseconds, an
informational warning is issued at runtime. These values are
outside the tested limits.
Restrictions on Changing
The rpc_clnt_idle_timeout tunable is dynamic. System reboot is not required to activate changes made
to this tunable. Changes made to this tunable are applicable only for TCP connections that are
created after the value of the tunable is modified.
Modifying the Value
If you prefer to have idle TCP connections cleaned up in less than 5 minutes, decrease the value. If
you prefer that idle TCP connections remain available for longer than 5 minutes, increase the value.
However, this tunable only controls the client behavior.
To change the server-side behavior with respect to idle TCP connections, modify the
rpc_svc_idle_timeout parameter. For more information, see
rpc_svc_idle_timeout.
2.3.2 rpc_clnt_max_conns
Description
The rpc_clnt_max_conns tunable controls the number of TCP connections between NFS clients and
NFS servers. By default, the NFS client opens a single TCP connection to each different server address
destination it mounts filesystems from, regardless of the number of filesystems mounted from that server
destination. The client multiplexes all of the requests for these filesystems across the single connection.