A cluster consists of two Exchange Server computers (called nodes) that share:
one or more common physical disk drives
an IP address
a network name
and Exchange Server cluster resources
Within a Microsoft Exchange Server cluster, only one of the nodes in the cluster can service network requests at any one time.
The node that owns all clustered resources is called the active node. It owns the shared disk(s), the IP address, and the network name for the cluster, and it runs the Microsoft Exchange Server services. If the active node in a cluster experiences a hardware failure, Microsoft Exchange Server services fail over to the inactive node, which then becomes the active node.
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