Managing Serviceguard 11th Edition, Version A.11.16, Second Printing June 2004

Planning and Documenting an HA Cluster
Cluster Configuration Planning
Chapter 4152
The time after which a node may decide that the other
node has become unavailable and initiate cluster
reformation. This parameter is entered in
microseconds.
Default value is 2,000,000 microseconds in the ASCII
file. Minimum is 2 * (Heartbeat Interval). The
maximum recommended value for this parameter is
30,000,000 in the ASCII file, or 30 seconds in
Serviceguard Manager. The default setting yields the
fastest cluster reformations. However, the user of the
default value increases the potential for spurious
reformations due to momentary system hangs or
network load spikes. For a significant portion of
installations, a setting of 5,000,000 to 8,000,000 (5 to 8
seconds) is more appropriate.
The maximum value recommended is 30 seconds and
the maximum value supported is 60 seconds.
AUTO_START_TIMEOUT
The amount of time a node waits before it stops trying
to join a cluster during automatic cluster startup. In
the ASCII cluster configuration file, this parameter is
AUTO_START_TIMEOUT. All nodes wait this amount of
time for other nodes to begin startup before the cluster
completes the operation. The time should be selected
based on the slowest boot time in the cluster. Enter a
value equal to the boot time of the slowest booting node
minus the boot time of the fastest booting node plus
600 seconds (ten minutes).
Default is 600,000,000 microseconds in the ASCII file
(600 seconds in Serviceguard Manager).
NETWORK_POLLING_INTERVAL
The frequency at which the networks configured for
Serviceguard are checked. In the ASCII cluster
configuration file, this parameter is
NETWORK_POLLING_INTERVAL.
Default is 2,000,000 microseconds in the ASCII file (2
seconds in Serviceguard Manager). Thus every 2
seconds, the network manager polls each network