How to Install Exchange Server Updates on DAG Members
Applies to: Exchange Server SE / 2019 / 2016 / 2013 / 2010 Exchange Server updates on a Database Availability Group (DAG) should be installed one member at a time. The main goal is to move active databases away from the server, prevent them from activating back during maintenance, install the update, and then return the server to production. The original version of this article was written for Exchange 2010 SP1 and used the term Update Rollup. Current Exchange Server servicing uses Cumulative Updates (CU), Security Updates (SU), and when required Hotfix Updates (HU). The DAG maintenance principle is still the same. In This Article 1. Before You Start 2. Put the DAG Member in Maintenance Mode 3. Install the Exchange Update 4. Return the Server to Production 5. Update…
