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Microsoft Exchange Server Database Availability Group Solution

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Best for businesses that need Office applications plus cloud file storage and sharing. Business-class email not included.

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A DAG is a boundary for mailbox database replication, database and server switchovers and failovers, and an internal component called Active Manager. Active Manager, which runs on every Mailbox server, manages switchovers and failovers within DAGs.

Brand Microsoft
Product Type Solution
OS Compatibility Windows server 2012 R2, Windows server 2016
Feature 01 A database availability group (DAG) is the base component of the Mailbox server high availability and site resilience framework built into Microsoft Exchange Server 2016. A DAG is a group of up to 16 Mailbox servers that hosts a set of databases and provides automatic database-level recovery from failures that affect individual servers or databases.
Feature 02 Database Availability Groups (DAGs) are Microsoft’s go to solution for providing high availability for Exchange 2013 and Exchange 2016 mailbox servers. Even so, it is critically important for administrators to consider whether or not a DAG is the most appropriate high availability solution for their organization.
Feature 03 The primary advantage offered by DAGs is that of high availability for mailbox servers within an Exchange Server organization. DAGs make use of failover clustering. As such, the failure of a DAG member results in any active mailbox databases failing over to another DAG member.
Feature 04 DAGs have historically proven to be an acceptable high availability solution for medium sized organizations. While it is true that DAGs fail to protect the individual server roles, Exchange stores all of its configuration information in the Active Directory, which means that entire servers can be rebuilt
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A DAG is a boundary for mailbox database replication, database and server switchovers and failovers, and an internal component called Active Manager. Active Manager, which runs on every Mailbox server, manages switchovers and failovers within DAGs.

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