Using Serviceguard Extension for RAC, 2nd Edition, February 2005 Update

Table Of Contents
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 9000 series 800 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 HP 9000 series 800 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.