This article explains the different types of clustering technology available with the exchange 2007 server. The exchange 2007 version has some new exciting features in terms of the high availability. It has four types of clustering and which has its own level of fault tolerance and availability. I have also added the diagram for better understanding.
1. Single copy clusters(SCC):
# This cluster type is similar to the one as in previous exchange versions. In fact it is exactly similar to the one in exchange 2003.
# Uses a single copy of database is shared between the nodes of the cluster.
# The database copy is stored in the SAN Storage device and also at any point of time the database will be owned by single node.
# Fault tolerance – There is chance of SOP i.e., Single point of failure. SCC environment works great if a node/server fails, but still Database failure in the SAN will cause the damage.