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Microsoft® Exchange Server 2010 Inside Out by Tony Redmond

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Restoring to a recovery database

If you operate a DAG and experience a server or storage outage, you should be able to switch over to a database copy and continue to serve users while you work on the problem. The value of DAGs is expressed in that short sentence: Service continues despite a storage or server outage. Of course, this assumes that you have sufficient database copies in place to cope with the failure and that the failure doesn’t knock out multiple database copies. If you don’t operate a DAG and suffer a storage failure, you might need to revert to a recovery from backup.

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