Upgrading servers in a DAG

Just as with older clusters, you have to take a certain amount of care when you apply patches and other upgrades to servers in a DAG. The general approach is to remove the target server from the DAG in a way that maintains user service, apply the upgrade, and then reintroduce the server. Two usual scenarios occur: multirole servers and dedicated mailbox servers.

Multirole servers usually support the mailbox and CAS roles, although in smaller deployments they might support mailbox, CAS, and hub transport. It will be difficult to maintain service if the target server is the only one that supports the CAS and hub transport roles, so we will assume that other servers (in or outside the DAG) provide these services. The steps ...

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