Clustering in the Combined System
Both Lotus Domino and WebSphere offer what each calls “clustering.” However, clustering in Domino is quite different than clustering in WebSphere, even though the basic concept is the same—i.e., to have a group of servers appear as if they are one server. Clustering is a basic way for both Domino and WebSphere to provide high availability (one server in a cluster can crash but the cluster is still available and fully functional) and high scalability (just double the number of servers in the cluster, and you've doubled the capacity of the cluster).
J2EE application server vendors define a cluster as a group of machines working together to transparently provide enterprise services (support for JNDI, EJB, JSP, HttpSession ...
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