Hi

I am wanting to upgrade our Exchange 2010 SP1 servers to Exchange 2010 SP3 inc. RU1

The primary environment consists of 1 CAS server, 1 HUB server and 1 MBX server.

The Disaster Recovery site consists of a multi-role server that houses all roles (CAS/HUB/MBX)

There is a DAG setup between the MBX servers, cross site. I have configured all the settings to disable auto failover of databases as the DAG is setup purely for DR not HA.

My query is, if when installing SP3 and RU1 I am happy for there to be down time in the primary site (i.e no Outlook access), do I need to run any of the DAG prep scripts? As a lot of what they do is already done to prevent auto failover.

My plan

• Run ADPREP - wait for replication
• Suspend the database copy
• Complete the SP3 and RU1 updates at the DR site first as I am lead to believe SP1 and SP3 can coexist.
• Resume the database copies to ensure replication works
• Backup CAS/HUB using Veeam
• Test restore using Instant Recovery
• Install SP3 and RU on CAS/HUB servers
• Suspend Database copy
• Shutdown MBX server and backup using Veeam
• Test restore using Instant Recovery
• Install SP3 and RU1 on MBX server
• resume database copy
• Complete testing

Thanks in advance

Cheers

David