Chapter 12. ServiceGuard for Linux

ServiceGuard for Linux (what I'll call ServiceGuard in this chapter) is a High Availability (HA) application. It is used in conjunction with other HA techniques to produce a loosely coupled cluster. An application running on a primary system can failover to a backup system should a failure or other switch over condition exist on the primary system. ServiceGuard can detect failures of a CPU, LAN, application, and other components.

All the systems and all the application packages have IP addresses. When a failure occurs, the another system runs the high availability package and the IP address of the package moves with the package to the backup system. If only a LAN card fails in a primary system, ServiceGuard will fail over to a standby LAN card rather than the backup system.