Managing MC/ServiceGuard NFS for Linux, December 2001

MC/ServiceGuard NFS for LINUX Introduction
Overview of MC/ServiceGuard NFS
Chapter 18
Overview of MC/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.
MC/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.
MC/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 MC/ServiceGuard coordinates the transfer
between components.
MC/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 MC/ServiceGuard cluster.
After MC/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.