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

Table Of Contents
Introduction to Serviceguard Extension for RAC
Extended Distance Cluster Using Serviceguard Extension for RAC
Chapter 1 29
Extended Distance Cluster Using
Serviceguard Extension for RAC
Simple Serviceguard clusters are usually configured in a single data
center, often in a single room, to provide protection against failures in
CPUs, interface cards, and software. Extended Serviceguard clusters are
specialized cluster configurations, which allow a single cluster to extend
across two or three separate data centers for increased disaster
tolerance. Depending on the type of links employed, distances of up to
100 km between data centers can be achieved.
Refer to Chapter 2 of the Designing Disaster Tolerant High Availability
Clusters manual, which discusses several types of extended distance
cluster that use basic Serviceguard technology with software mirroring
(using MirrorDisk/UX or Veritas VxVM) and Fibre Channel.