Managing Serviceguard Eighteenth Edition, September 2010

In addition, you should observe the following guidelines.
• CacheFS and AutoFS should be disabled on all nodes configured to run a package
that uses NFS mounts.
For more information, see the NFS Services Administrator's Guide HP-UX 11i version
3 at www.hp.com/go/hpux-networking-docs.
• HP recommends that you avoid a single point of failure by ensuring that the NFS
server is highly available.
NOTE: If network connectivity to the NFS Server is lost, the applications using
the imported file system may hang and it may not be possible to kill them. If the
package attempts to halt at this point, it may not halt successfully
• Do not use the automounter; otherwise package startup may fail.
• If storage is directly connected to all the cluster nodes and shared, configure it as
a local filesystem rather than using NFS.
• An NFS file system should not be mounted on more than one mount point at the
same time.
• Access to an NFS file system used by a package should be restricted to the nodes
that can run the package.
For more information, see the white paper Using NFS as a file system type with Serviceguard
11.20 on HP-UX 11i v3 which you can find at www.hp.com/go/
hpux-serviceguard-docs. This paper includes instructions for setting up a sample
package that uses an NFS-imported filesystem..
See also the description of fs_name (page 307), fs_type (page 308), and the other
filesystem-related package parameters.
Planning for Expansion
You can add packages to a running cluster. This process is described in “Cluster and
Package Maintenance” (page 321).
When adding packages, be sure not to exceed the value of max_configured_packages as
defined in the cluster configuration file; see “Cluster Configuration Parameters ”
(page 143). You can modify this parameter while the cluster is running if you need to.
Choosing Switching and Failover Behavior
To determine the failover behavior of a failover package (see “Package Types”
(page 68)), you define the policy that governs where Serviceguard will automatically
start up a package that is not running. In addition, you define a failback policy that
determines whether a package will be automatically returned to its primary node when
that is possible.
176 Planning and Documenting an HA Cluster