HP-UX IPSec version A.02.01 Administrator's Guide

HP-UX IPSec and Serviceguard
Introduction
Appendix G 327
Introduction
An Serviceguard cluster is a networked group of HP 9000 or Integrity
servers (host systems known as nodes) with redundant hardware and
software so that a single point of failure does not significantly disrupt
service. Application packages (individual HP-UX processes) can be
grouped together in failover packages. If a single service, node,
network or other resource fails, Serviceguard can automatically transfer,
or fail over, control of the package to another node (an adoptive node)
within the cluster.
Figure G-1 Serviceguard Cluster
Serviceguard periodically sends heartbeat messages to determine if a
cluster node is available. When using Serviceguard with HP-UX IPSec,
HP recommends that you have at least one network dedicated to sending
and receiving heartbeat messages. In Figure G-1, the interface addresses
10.1.1.1, 10.2.2.2 and 10.3.3.3 are attached to a network used only for
heartbeat messages. The cluster nodes also send and receive heartbeat
messages on interfaces attached to the second network (the 15.*.*.*
LAN), which used for both heartbeat and data packets.