Database Availability Group (DAG) – Switchover & Redistribute MBX databases – Easy Series Part 1

A switchover is a scheduled outage of a database or server that is explicitly initiated by a cmdlet or by the managed availability system in Exchange Server. Switchovers are typically done to prepare for performing a maintenance operation (like monthly patching, Cumulative update, or hardware replacement).

Switchovers involve moving the active mailbox databases copy to another server in the database availability group (DAG). If no healthy target is found during a switchover, administrators will receive an error and the mailbox database will remain up or mounted.