Lotus Domino Administrator 6.5 Help - Before you create a cluster

CLUSTERS

Before you create a cluster
Before you create the cluster, complete the following tasks:

Determine which servers will be in the cluster and what they are named.
Install or upgrade to the Lotus Domino 6.5 or Lotus Domino 6 Enterprise server or the Lotus Domino 6.5 or Lotus Domino 6 Utility server. These servers enable you to set up a Domino 6 cluster.
Note You can include the following Domino servers in a cluster: the Domino Release 5 Enterprise server, the Domino Release 4.62 Enterprise server, the Domino Release 4.6 Advanced Services server, and the Domino Release 4.5 Advanced Services server. However, these servers will not have access to the features that are new in Domino 6.5 or Domino 6.
Be sure that you have reviewed the requirements for clustering and that all servers meet these requirements.
Distribute databases and replicas to the servers you plan to include in the cluster.
Set up scheduled replication between the cluster servers.