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A database availability group (DAG) is a high availability (HA) and data recovery feature of Exchange Server 2010.
A database availability group, which can consist of up to 16 Exchange mailbox servers, automates
recovery at the database-level after a
database, server or network failure.
Database availability groups replaced Exchange Server 2007’s high-availability model, which was
based on local continuous replication (LCR), standby continuous replication (SCR), single copy
clustering (SCC) and cluster continuous replication (CCR).
Exchange administrators can choose to use DAGs in different geographic locations and in many
different architectural designs and configurations, making it considerably more flexible than
previous high-availability setups.
NTFAQGuy explains how high availability features have evolved from Exchange Server 2003 through
Exchange Server 2010 and at 4 minutes in, explains how Exchange database availability groups
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