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

Note: If the tunable is set to a value greater than 10
asynchronous requests, an informational warning is issued
at runtime. Any value greater than 10 is outside the tested
limits.
Restrictions on Changing
The nfs3_async_clusters tunable is dynamic. System reboot is not required to activate changes made
to this tunable. Any change made to the value of the tunable is effective immediately. However, the
cluster setting is per filesystem at mount time. The system administrator must unmount and re-mount
each filesystem after changing this tunable. Only NFSv3 mount points are affected by changing the
value of the nfs3_async_clusters tunable.
Modifying the Value
If server functionality depends upon clusters of operations coming from the client, increase the value of
this tunable. However, this can impact the operations in other queues if they have to wait until the
current queue is empty or the cluster limit is reached.
Note: Setting the value of nfs3_async_clusters to 0 causes all
of the queued requests of a particular type to be processed
before moving to the next type.
2.1.18 nfs3_bsize
Description
The nfs3_bsize tunable controls the logical block size used by NFSv3 clients. Block size represents the
amount of data the client reads from or writes to the server.
The nfs3_bsize tunable works in conjunction with the nfs3_max_transfer_size,
nfs3_max_transfer_size_cots, and nfs3_max_transfer_size_clts tunables when determining the
maximum size of these I/O requests. For NFSv3 TCP traffic, the transfer size corresponds to the
smallest value of nfs3_bsize, nfs3_max_transfer_size, and nfs3_max_transfer_size_cots. For NFSv3
UDP traffic, the transfer size corresponds to the smallest value of nfs3_bsize, nfs3_max_transfer_size,
and nfs3_max_transfer_size_clts.
The nfs2_bsize tunable controls the logical block size used by NFSv2 clients. The nfs4_bsize tunable
controls the logical block size used by NFSv4 clients. For more information on these tunables, see:
• nfs2_bsize
• nfs4_bsize
Tested Values
Default: 32768
Min: 4096
Max: 1048576