Managing NFS and KRPC Kernel Configurations in HP-UX 11i v2 (Oct 2008)

1 Introduction

NFS is a network-based application that offers transparent file access across a network. The behavior

and performance of NFS depends on numerous kernel tunables. Tunables are variables that control

the behavior of the HP-UX kernel. To achieve optimal performance, the system administrator can

modify the values of the tunables.

This white paper discusses the configurable Network File System (NFS) and Kernel Remote Procedure

Call (KRPC) tunables in HP-UX 11i v2 and describes how to manage them. Appendix A contains a list

of tunable setting recommendations that have been shown to provide improved performance and

behavior on most HP-UX NFS systems. Appendix B provides a set of instructions for customers who

previously or currently use adb to tune their systems and wish to migrate to the new kctune-based

method. HP strongly encourages all customers to use kctune in place of adb whenever possible.