Novell BUSINESS CONTINUITY CLUSTERING 1.1 SP1 - 9-21-2010 ADMINISTRATION GUIDE FOR OPEN ENTERPRISE SERVER 1 SP2 LINUX Administration Manual page 11

Cluster of Clusters
A cluster of clusters consists of two or more clusters in which each cluster is located in a
geographically separate area. A cluster of clusters provides the ability to fail over selected cluster
resources or all cluster resources from one cluster to another cluster. Typically, replication of data
blocks between SANs is performed by SAN hardware, but it can be done by host-based mirroring
for synchronous replication over short distances.
Cluster of Clusters
Figure 1-2
Building A
Ethernet Switch
Server Server Server
1A 2A 3A
Fibre Channel
Switch
Fibre Channel
Disk Arrays
Cluster Site 1
Two independent clusters at
geographically separate sites
WAN
eDirectory
DirXML
Server
4A
SAN
Disk blocks
Building B
Ethernet Switch
Server Server Server
1B 2B 3B
Fibre Channel
Switch
Fibre Channel
Disk Arrays
Cluster Site 2
Server
4B
Overview 11