Managing Serviceguard 13th Edition, February 2007

Planning and Documenting an HA Cluster
Cluster Configuration Planning
Chapter 4162
interface to make sure it can still send and receive
information. Using the default is highly recommended.
Changing this value can affect how quickly a network
failure is detected. The minimum value is 1,000,000 (1
second). The maximum value recommended is 15
seconds, and the maximum value supported is 30
seconds.
MAX_CONFIGURED_PACKAGES
This parameter sets the maximum number of packages
that can be configured in the cluster.
The minimum value is 0, and the maximum value is
150. The default value for Serviceguard A.11.17 is 150,
and you can change it without halting the cluster.
VOLUME_GROUP
The name of an LVM volume group whose disks are
attached to at least two nodes in the cluster. Such disks
are considered cluster aware. In the ASCII cluster
configuration file, this parameter is VOLUME_GROUP.
The volume group name can have up to 39 characters.
Access Control Policies
For each policy, specify USER_NAME, USER_HOST, and
USER_ROLE. (In the standalone, management-
application version of Serviceguard Manager,
USER_HOST must be the name of the session server; see
“Using the Serviceguard Management Application” on
page 30 for more information about this version of
Serviceguard Manager.) Policies set in the
configuration file of a cluster and its packages must not
be conflicting or redundant. For more information, see
“Editing Security Files” on page 189.
FAILOVER_OPTIMIZATION
You will only see this parameter if you have installed
Serviceguard Extension for Faster Failover, a
separately purchased product. You enable the product
by setting this parameter to TWO_NODE. Default is
disabled, set to NONE. For more information about the
product and its cluster-configuration requirements, go