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Mastering Microsoft Exchange Server 2016, 2nd Edition by Vladimir Meloski, Byron Wright, Brian Svidergol, Clifton Leonard

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Chapter 20Creating and Managing Database Availability Groups

Messaging services for most organizations are deemed business-critical and need to be online with minimal to no data loss during a variety of failure scenarios. Organizations are also looking for more flexibility in managing a Mailbox server during business hours while minimizing the impact on end users. To assist organizations with these requirements, Exchange Server 2007 and later versions include new solutions for high availability. Through a process called continuous replication, a mailbox database can be copied to one or more Mailbox servers and the database is kept up-to-date through transaction log shipping and replay into the passive copy (or copies) of the database. In Exchange Server 2010, this continuous-replication process matured as database availability groups (DAGs).

You add Mailbox servers into the DAG as members, and then you can determine which databases will be replicated to which member servers. The value here is simple. If the Mailbox server hosting the active database were to fail or if maintenance is going to be performed on a Mailbox server, a copy of that mailbox database can be activated on a different Mailbox server with minimal to no interruption of mailbox services to the end users.

Long before the DAG is created and Mailbox servers are added, a design is created laying out the configuration of the DAG. The configuration should be built around business and technical requirements while taking ...

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