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

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sequential access to a file is discovered. Read-ahead operations increase concurrency and read
throughput.
The nfs3_nra tunable controls the number of read-ahead operations queued by NFSv3 clients. The
nfs4_nra tunable controls the number of read-ahead operations queued by NFSv4 clients. For more
information on these tunables, see:
•
nfs3_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 nfs2_nra 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 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.
2.1.16
nfs2_shrinkreaddir
Description
The nfs2_shrinkreaddir tunable is a solution for a defect that causes older NFS servers to incorrectly
handle NFSv2 READDIR requests with more than 1024 bytes of directory information.
Tested Values
Default: 0 (Tunable is disabled and the 1024-byte limit is not enforced)
Min: 0
Max: 1 (Tunable is enabled and the 1024-byte limit is enforced)
Restrictions on Changing
The nfs2_shrinkreaddir 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 this tunable.
Modifying the Value
Modify this tunable only if you know or suspect that you are dealing with an older NFSv2 server that
cannot handle READDIR requests of size larger than 1K.