Managing NFS and KRPC Kernel Configurations in HP-UX 11i v3 (762807-002, June 2014)

2.1.31 nfs3_nra
Description
The nfs3_nra tunable controls the number of read-ahead operations queued by NFSv3 clients when
sequential access to a file is discovered. Read-ahead operations increase concurrency and read
throughput.
The nfs2_nra tunable controls the number of read-ahead operations queued by NFSv2 clients. The
nfs4_nra tunable controls the number of read-ahead operations queued by NFSv4 clients. For more
information on these tunables, see:
• nfs2_nra
• nfs4_nra
Tested Values
Default: 4
Min: 0
Max: 16
Note: If the tunable is set to a value greater than 16, an
informational warning is issued at runtime. Any value
greater than 16 is outside the tested limits.
Restrictions on Changing
The nfs3_nra tunable is dynamic. System reboot is not required to activate a change made to this
tunable. Only NFSv3 mount points are affected by changing the value of this tunable.
Modifying the Value
If the network has high available bandwidth and the client and server have sufficient CPU and
memory resources, increase the value of this tunable. This increase enables you to effectively utilize
the available network bandwidth as well as the client and server resources.
If the network has low available bandwidth, decrease the value of this tunable. This decrease ensures
that the NFS client does not overload the network.
2.1.32 nfs3_pathconf_disable_cache
Description
The nfs3_pathconf_disable_cache tunable controls the caching of pathconf(2) information for NFSv3
mounted filesystems.
The nfs4_pathconf_disable_cache tunable controls the caching of pathconf(2) information for NFSv4
mounted filesystems. For more information on the tunable, see nfs4_pathconf_disable_cache.
Tested Values
Default: 0 (Pathconf cache is enabled)
Min: 0
Max: 1 (Pathconf cache is disabled)