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

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.

Modifying the value

Modifying the value of this tunable might reduce the time required to search for an entry in the access

cache. For example, if the hash buckets contain numerous entries and you increase the number of

buckets then the speed increases. However, if the value is increased to a very high value then the

speed might not increase as the change impacts memory consumption.

If the tunable is set to a value lower than 8, the time required to search for an entry might not be

significantly reduced. If the tunable is set to a value higher than 1024, the size of the hash table

increases which impacts memory consumption.

This tunable is not available in the next release of HP-UX. Starting with the HP-UX 11i v3 release, the

hashed search algorithm is used by default and this tunable is not user-configurable.

Note: This tunable takes effect only if the value of the

nfs3_new_acache tunable is set to 1.

2.1.19 nfs3_jukebox_delay

Description

The nfs3_jukebox_delay tunable specifies the time interval the NFS client must wait after receiving the

NFS3ERR_JUKEBOX error before retransmitting the request to the server.

If an NFS client requests a file on the server, and if the file is unavailable because it resides on a slow

media or has been migrated on an HSM storage device, the server generates the NFS3ERR_JUKEBOX

error. If the server returns this error, it indicates that the file cannot be accessed for a considerable

amount of time. The retransmission of the request depends on the time interval specified by this

tunable.

Tested values

Default: 1000 (10 seconds)

Min: 100 (1 second)

Max: 6000 (60 seconds)

Note: If the tunable is set to a value less than 100 or greater

than 6000, an informational warning is issued at runtime.

These values are outside the tested limits.