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Exchange 2007 Cluster Continuous Replication

Exchange Server 2007 introduces a new feature called cluster continuous replication (CCR). CCR combines the log shipping and replay functionality in Exchange 2007 with the failover functionality in the Microsoft cluster service (MSCS). Unlike previous versions of Exchange that also supported clustering, CCR does not require shared storage. Instead, each node in the cluster has it own locally connected storage (e.g., SAS, DAS, iSCSI). On the active node in the cluster is the production clustered mailbox server (CMS). On the passive node is a relatively up-to-date copy of the CMS that is created and maintained by log shipping and replay.

Because CCR does not use shared storage for the Exchange data, we wanted to make sure we didn't need shared storage anywhere in the cluster. The only other resource in the cluster besides the CMS is the default cluster group, which contains the quorum resource. To eliminate the need for shared storage to host the quorum resource, Exchange 2007 supports the Majority Node Set (MNS) quorum.(continue at source)

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