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

Introduction to Serviceguard Extension for RAC
Extended Distance Cluster Using Serviceguard Extension for RAC
Chapter 1 37
Extended Distance Cluster Using
Serviceguard Extension for RAC
Basic 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 Understanding and Designing Serviceguard
Disaster Tolerant Architectures user’s guide, which discusses several
types of extended distance cluster configurations that use basic
Serviceguard technology with software mirroring (using MirrorDisk/UX
or CVM) and Fibre Channel).