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

The nfs3_bsize tunable controls the logical block size used by NFSv3 clients. The nfs4_bsize tunable
controls the logical block size used by NFSv4 clients. For more information on these tunables, see:
• nfs3_bsize
• nfs4_bsize
Tested Values
Default: 8192
Min: 8192
Max: 65536
Note: If the tunable is set to a value greater than 65536
bytes, an informational warning is issued at runtime. Any
value greater than 65536 is outside the tested limits. The
value of the tunable must be a power of 2.
Restrictions on Changing
The nfs2_bsize 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 logical
block size is set per filesystem at mount time. The system administrator must unmount and re-mount
each filesystem after changing this tunable. Only NFSv2 mount points are affected by changing the
value of the nfs2_bsize tunable.
Modifying the Value
The transfer size for NFSv2 is limited to 8192 bytes. Changing this value beyond 8192 bytes does
not have any benefits. This tunable is a system wide global tunable and thus affects every NFSv2
filesystem. To control the transfer sizes of specific NFSv2 filesystems, use the rsize and wsize mount
options. Refer to the mount_nfs(1M) manpage for more information.
2.1.10 nfs2_cots_timeo
Description
The nfs2_cots_timeo tunable controls the default RPC timeout for NFSv2 mounted filesystems using a
connection-oriented transport such as TCP.
The nfs3_cots_timeo tunable controls the default RPC timeout for NFSv3 mounted filesystems. The
nfs4_cots_timeo tunable controls the default RPC timeout for NFSv4 mounted filesystems. For more
information on these tunables, see:
• nfs3_cots_timeo
• nfs4_cots_timeo
Tested Values
Default: 600 tenths of a second (1 minute)
Min: 10 tenths of a second (1 second)
Max: 36000 tenths of a second (1 hour)