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.
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