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

2.4 KRPC Server Tunables
Table 2.4-1 lists the KRPC server tunables. The last column specifies which ONCplus version first
introduced the tunable.
Table 2.4-1 KRPC Server Tunables
Kctune Tunable Name Range Default
Value
Units ONCplus
Version
rpc_svc_cltsmaxdupreqs
1 to MAXINT 1024 Cache Entries B.11.31_LR
rpc_svc_cotsmaxdupreqs
1 to MAXINT 1024 Cache Entries B.11.31_LR
rpc_svc_default_max_same_xprt
1 to MAXINT 8 Requests B.11.31_LR
rpc_svc_idle_timeout
0 to MAXINT 360000 Milliseconds B.11.31_LR
rpc_svc_cpu_binding
0 to 1 0 Boolean B.11.31_LR
2.4.1 rpc_svc_cltsmaxdupreqs
Description
The rpc_svc_cltsmaxdupreqs tunable controls the size of the duplicate request cache, which detects
RPC level retransmissions on connectionless transports such as UDP. This cache avoids processing
retransmitted requests that are non-idempotent.
Tested Values
Default: 1024
Min: 1
Max: 2048
Note: If the tunable is set to a value greater than 2048, an
informational warning is issued at runtime. Any value
greater than 2048 is beyond the tested limit.
Restrictions on Changing
The rpc_svc_cltsmaxdupreqs tunable is dynamic. System reboot is not required to activate changes
made to this tunable. However, if the cache is full, decreasing the current value has no effect until the
system is rebooted.
Modifying the Value
Increasing the value of this tunable to a value higher than the default can result in longer search times
to find entries in the cache. These longer search times can affect the performance of the NFS server. If
a non-idempotent request is mistakenly serviced twice by the NFS server, decreasing the value of this
tunable can trigger false failures on the NFS client side. For example, if an attempt to create a
directory returns a status of failed but the directory is actually created, the retransmitted MKDIR
request was not detected by the server.