REF: Understanding Exchange 2010 DAG – Part 2

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1. Mailbox Database Copy Management
  • Adding mailbox database copies
    When you add a copy of a mailbox database, continuous replication is automatically enabled between the existing database and the database copy.
  • Configuring mailbox database copy properties
    You can configure a variety of properties, such as the database activation policy, the amount of time, if any, for replay lag and truncation lag, and the activation preference for the database copy.
  • Suspend or resume a mailbox database copy
    You can suspend a mailbox database copy in preparation for seeding, or for other forms of maintenance. You can also suspend a mailbox database copy for activation only. This configuration prevents the system from automatically activating the copy as a result of a failure, but it still allows the system to keep the database copy up-to-date with log shipping and replay.
  • Updating a mailbox database copy
    Updating, also known as seeding, is the process in which a copy of a mailbox database is added to another Mailbox server. This becomes the baseline database for the copy. After the initial first seed of the baseline database copy, only in rare circumstances will the database need to be seeded again.
  • Activate a mailbox database copy
    Activating is the process of designating a specific passive copy as the new active copy of a mailbox database. This process is referred to as a switchover. For more information, see "Switchovers and Failovers" below.
  • Removing a mailbox database copy
    You can remove a mailbox database copy at any time. From time to time, it may be necessary to remove a mailbox database copy. For example, you cannot remove a Mailbox server from a DAG until all mailbox database copies are removed from the server. In addition, you must remove all copies of a mailbox database before you can change the path for a mailbox database.

 

2. Management DAG by PowerShell


a. For detailed steps to add a mailbox database copy, see Add a Mailbox Database Copy.
b. For detailed steps to configure mailbox database copies, see Configure Mailbox Database Copy Properties.
c. For more information about each of the above management tasks, and about managing mailbox database copies in general, seeManaging Mailbox Database Copies.
d. For detailed steps to remove a mailbox database copy, see Remove a Mailbox Database Copy.

3. Switchovers and Failovers

For detailed steps to perform a database switchover, see Activate a Mailbox Database Copy.
For detailed steps to perform a server switchover, see Perform a Server Switchover.
Switchovers can also be performed at the datacenter level.
For more information about datacenter switchovers, see Data Center Switchovers.

 

Blog Extended Reading

More Information & Reference
1. Mailbox Database Copy Management

 

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