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Microsoft® Exchange Server 2010 Inside Out by Tony Redmond

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Datacenter Activation Coordination

Some DAGs will be deployed across datacenters in multiple sites. These environments create a specific problem when catastrophic hardware failures occur that knock several servers out across multiple datacenters. Normally, when multiple servers in a DAG are affected, the DAG stays offline until the majority of the servers are restored to good health and come online again and the cluster is able to establish a quorum. At this point, Active Manager attempts to restart DAG operations and mount databases to recover from the failure.

If all goes well, the databases will come back online and all the servers will be able to communicate with each other. However, if communications between the datacenters are not available, ...

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