Managing Serviceguard NFS for Linux, September 2006

Serviceguard NFS for LINUX Introduction
Overview of Serviceguard NFS
Chapter 16
Overview of Serviceguard NFS
An NFS server is a host that “exports” its local directories (makes them
available for client hosts to mount using NFS). On the NFS client, these
mounted directories look to users like part of the client’s local file system.
Serviceguard allows you to create high availability clusters of HP Linux
computers (nodes). A high availability computer system allows
applications to continue in spite of a hardware or software failure.
Serviceguard systems protect users from software failures as well as
from failure of a system processing unit (SPU) or local area network
(LAN) component. In the event that one component fails, the redundant
component takes over, and Serviceguard coordinates the transfer
between components.
Serviceguard NFS is a separate set of shell scripts, and a binary file. One
shell script (NFS control script) is provided as a template for an NFS
server package. Customize this script to meet your specific needs.
In the event of failure, the NFS server package containing the exported
file systems moves to a different node in the Serviceguard cluster. After
Serviceguard starts the NFS package on the adoptive node, the NFS file
systems are re-exported from the adoptive node with minimum
disruption of service to users. The client side “hangs” until the NFS
server package comes up on the adoptive node. When the service returns,
the user can continue access to the file. You do not need to restart the
client.