I am preparing to apply SP1 to my Exchange 2013 environment. I have a set of Exch servers in two locations. Each has 2 CAS servers and 6 mailbox servers. I found the following link which explains how to apply updates to the DAG servers.
http://technet.microsoft.com/en-us/library/dd298065(v=exchg.150).aspx
I have not found information in relation to the CAS servers. Should the CAS servers be updated before or after the DAGs? My CAS servers are in a HLB. Should I just disable one CAS server in the HLB VIP while I update it? Is there a specific process for upgrading the CAS servers. A way to put them in/out of maintenance?
Thanks!
Tom