Using Serviceguard Extension for RAC, 5th Edition, June 2007

Introduction to Serviceguard Extension for RAC
What is a Serviceguard Extension for RAC Cluster?
Chapter 116
What is a Serviceguard Extension for RAC
Cluster?
A high availability cluster is a grouping of HP servers having
sufficient redundancy of software and hardware components that a
single point of failure will not disrupt the availability of computer
services. High availability clusters configured with Oracle Real
Application Cluster software are known as RAC clusters. Figure 1-1
shows a very simple picture of the basic configuration of a RAC cluster
on HP-UX.
Figure 1-1 Overview of Oracle RAC Configuration on HP-UX
In the figure, two loosely coupled systems (each one known as a node)
are running separate instances of Oracle software that read data from
and write data to a shared set of disks. Clients connect to one node or the
other via LAN.