Serviceguard NFS Toolkit A.11.11.06, A.11.23.05 and A.11.31.05 Administrator's Guide

In order to make a Serviceguard file system available to all servers, all servers must NFS-mount
the file system. That way, access to the file system is not interrupted when the package fails over
to an adoptive node. An adoptive node cannot access the file system through the local mount,
because it would have to unmount the NFS-mounted file system before it could mount it locally.
And in order to unmount the NFS-mounted file system, it would have to kill all processes using
the file system.
Follow these steps to set up an NFS package with file systems that are NFS-mounted by
Serviceguard NFS servers:
1. Make a copy of the /etc/cmcluster/nfs/nfs_xmnt script.
cd /etc/cmcluster/nfs cp nfs_xmnt nfs1_xmnt
2. In the copy of the nfs_xmnt script, create an SNFS[n] and CNFS[n] variable for each file
system in the package that will be NFS-mounted by servers. The SNFS[n] variable is the
server location of the file system, and the CNFS[n] variable is the client mount point of the
file system.
SNFS[0]="nfs1:/hanfs/nfsu011";CNFS[0]="/nfs/nfsu011"
In this example, nfs1is the name that maps to the package's relocatable IP address. It must
be configured in the name service used by the server (DNS, NIS, or the /etc/hosts file).
If a server for the package will NFS-mount the package's file systems, the client mount point
(CNFS) must be different from the server location (SNFS).
3. Copy the script you have just modified to all the servers that will NFS-mount the file systems
in the package.
4. After the package is active on the primary node, execute the nfs_xmnt script on each server
that will NFS-mount the file systems.
/etc/cmcluster/nfs/nfs1_xmnt start
Hewlett-Packard recommends that you execute the nfs_xmnt script from the command
line after the package is active on the primary node. However, you can configure the
nfs_xmnt script to be executed by the NFS control script in the
customer_defined_run_cmds function.
function customer_defined_run_cmds
{
/etc/cmcluster/nfs/nfs1_xmnt start
remsh sage /etc/cmcluster/nfs/nfs1_xmnt start
}
The second line in the function invokes remsh to run the nfs_xmnt script on remote host
sage.
Running the nfs_xmnt script from the NFS control script guarantees that the package is
active before the mount command executes. It prevents cross-mounted servers from becoming
deadlocked while each server hangs on the mount command, waiting for the other server's
package to become active. However, if the package fails to activate, or if the remsh command
fails, the file systems will not be mounted, and no error will be returned. The only way to
be sure the file systems are mounted successfully is to run the nfs_xmnt script manually
on each host where the file systems should be mounted.
For an example of a configuration with cross-mounted servers, see “Example Four - Two Servers
with NFS Cross-Mounts” (page 80).
Creating the Cluster Configuration File and Bringing Up the Cluster
To create the cluster configuration file, verify the cluster and package configuration files, and
run the cluster, perform the following steps:
36 Installing and Configuring Serviceguard NFS Legacy Package