HP-UX IPSec version A.02.00 Administrator's Guide

HP-UX IPSec and MC/ServiceGuard
Introduction
Chapter 8 237
Introduction
An MC/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, MC/ServiceGuard can
automatically transfer, or fail over, control of the package to another
node (an adoptive node) within the cluster.
Figure 8-1 MC/ServiceGuard Cluster
MC/ServiceGuard periodically sends heartbeat messages to determine
if a cluster node is available. When using MC/ServiceGuard with HP-UX
IPSec, HP recommends that you have at least one network dedicated to
sending and receiving heartbeat messages. In Figure 8-1, 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.