Serviceguard NFS Toolkit A.11.31.02, A.11.11.06, and A.11.23.05 Administrator's Guide

NOTE: Beginning with Serviceguard NFS A.11.11.03 and A.11.23.02, you can
address this limitation by enabling the File Lock Migration feature (see “Overview
of the NFS File Lock Migration Feature” (page 11)).
For HP-UX 11i v2 and 11i v3, the feature functions properly without a patch.
• If a server is configured to use NFS over TCP and the client is the same machine
as the server, which results in a loopback NFS mount, the client may hang for
about 5 minutes if the package is moved to another node. The solution is to use
NFS over UDP between NFS-HA-server cross mounts.
• The/etc/rmtabfile is not synchronized when an NFS package fails over to the
standby node. This is caused by the design of NFS, which does not keep track of
the state of thermtab. The man page for rmtabcontains a warning that it is not
always totally accurate, so it is also unreliable in a standard NFS server / NFS client
environment.
• AutoFS mounts may fail when mounting file systems exported by an HA-NFS
package soon after that package has been restarted. To avoid these mount failures,
AutoFS clients should wait at least 60 seconds after an HA-NFS package has started
before mounting file systems exported from that package.
NOTE: You cannot use Serviceguard NFS for an NFS diskless cluster server.
Overview of Serviceguard NFS Toolkit A.11.31.02 with Serviceguard
A.11.18 and Veritas Cluster File System Support
The Serviceguard NFS Toolkit A.11.31.02 now supports Serviceguard A.11.18, which
is configured with Veritas Cluster File System (CFS). The Serviceguard CFS feature
enables you to create a file system that can be mounted by all nodes in a cluster
environment. By configuring Serviceguard NFS Toolkit to utilize CFS, simultaneous
access to files and file systems is expanded to multiple NFS servers. It provides
performance improvement and cache coherency.
For detailed information using the Serviceguard NFS Toolkit A.11.31.02 with
Serviceguard A.11.18 and CFS support, see Serviceguard NFS Toolkit Support for Cluster
File System at:
http://docs.hp.com/en/ha.html#Highly%20Available%20NFS
The Serviceguard NFS Toolkit Support for Cluster File System must be considered as an
addendum to this guide.
HP recommends that you use the Serviceguard CFS feature instead of setting up the
server-to-server cross-mounting configuration as show in “Example Four - Two Servers
with NFS Cross-Mounts” (page 61).
The toolkit provides support for the variable HA_NFS_SCRIPT_EXTENSION in the
nfs.cntl control script. This new variable can be used to modify the name of the NFS
10 Overview of Serviceguard NFS