Managing Serviceguard 14th Edition, June 2007

Planning and Documenting an HA Cluster
Cluster Configuration Planning
Chapter 4 159
You cannot create a dual cluster-lock configuration
using LUNs.
FIRST_CLUSTER_LOCK_PV, SECOND_CLUSTER_LOCK_PV
The name of the physical volume within the Lock
Volume Group that will have the cluster lock written
on it. Used on only if a lock disk is used for tie-breaking
services. This parameter is FIRST_CLUSTER_LOCK_PV
for the first physical lock volume and
SECOND_CLUSTER_LOCK_PV for the second physical lock
volume. If there is a second physical lock volume, the
parameter SECOND_CLUSTER_LOCK_PV is included in
the file on a separate line. These parameters are only
used when you employ a lock disk for tie-breaking
services in the cluster.
Enter the physical volume name as it appears on each
node in the cluster (the same physical volume may
have a different name on each node). If you are creating
two cluster locks, enter the physical volume names for
both locks. The physical volume group identifier can
contain up to 39 characters (bytes).
For information about changing the configuration
while the cluster is running, see “Updating the Cluster
Lock Disk Configuration Online” on page 348.
HEARTBEAT_INTERVAL
The normal interval, in microseconds, between the
transmission of heartbeat messages from each node to
the cluster coordinator.
Default value is 1,000,000 microseconds; setting the
parameter to a value less than the default is not
recommended.
The default should be used where possible. The
maximum recommended value is 15 seconds and the
maximum value supported is 30 seconds or half the
NODE_TIMEOUT.
Can be changed while the cluster is running.