Managing NFS and KRPC Kernel Configurations in HP-UX 11i v2 (November 2013)

Tested values

Default: 0 (Dynamic retransmission is disabled)

Min: 0

Max: 1 (Dynamic retransmission is enabled)

Restrictions on changing

The nfs3_dynamic tunable is dynamic. System reboot is not required to activate changes made to this

tunable. However, the dynamic retransmission feature is set per filesystem at mount time. You must

unmount and re-mount each filesystem after changing this tunable. Only NFSv3 mount points are

affected when you change the value of this tunable.

Modifying the value

In congested networks, sending smaller sized NFS data packets can help if the network is dropping

larger data packets. Enabling this tunable enables you to adjust the read and write transfer sizes for

successful NFS I/O. If packets are not being dropped in the network, disabling this functionality

results in increased throughput. However, if the server response is delayed or the network is

overloaded, the number of timeouts can increase.

HP recommends leaving this tunable enabled because it helps the system minimize NFS packet loss

on congested networks.

2.1.17 nfs3_ enhanced_rddir_cache

Description

The nfs3_enhanced_rddir_cache tunable enables the support for 64bit inode numbers for NFSv3

mounted filesystems. The support for 64bit inode numbers for NFSv3 mounted filesystems is disabled

by default. Enable this tunable to support 64bit inode numbers for NFSv3 mounted filesystems.

Tested values

Default: 0 (Support for 64bit inode numbers is disabled.)

Min: 0

Max: 1 (Support for 64bit inode numbers is enabled.)

Restrictions on changing

The nfs3_enhanced_rddir_cache tunable is dynamic. System reboot is not required to activate a

change made to this tunable. Only NFSv3 mount points are affected when you change the value of

this tunable.

Note: If there are no NFS mount points in the system, any change

made to the value of the tunable is effective immediately. If

there are NFS mount points in the system, a system reboot is

required for the change to be activated.

Before you enable this tunable, you must install the following patch:

PHNE_43704 NFS