Ensuring high availability
Mailbox moves performed within a DAG have to take account of the replication activity that underpins the ability of the DAG to deliver high availability. Exchange includes two checks to reduce the possibility of data loss when mailboxes move between replicated databases on DAG members.
At points during the mailbox move, including at the end before Active Directory is updated with the new mailbox location, MRS queries Active Manager to determine whether replication is in a healthy state (less than 10 logs to be replayed and 3 to be copied) for the target mailbox database and its passive copies. The action MRS takes depends on the value of the DataMoveReplicationConstraint property of the target mailbox database. (You can ...
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