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Configuring DAG with different CU level ?

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Last Modified: 2017-03-27
Hi All,

I've got multiple Exchange server 2013 Standard mailboxes scattered around 3 different AD sites (same domain).

AD Site 1 - PRODEXC1-VM - Mailbox Server &CAS Role - SP1
AD Site 2 - PRODMBX01-VM - Mailbox Server  - SP1
AD Site 3 - PRODEXC2-VM - Mailbox Server &CAS Role - SP1+CU3

I'd like to deploy additional 3x Mailbox server on each site so that I can build DAG for each AD site.
As I read today, the latest CU is CU16, so can I install the new 3x mailbox server above with CU16 while the other is still as is ?

This is to avoid any outage.
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Tim EdwardsIT Team Lead - Unified Communications & Collaboration
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Senior IT System EngineerSenior Systems Engineer
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OK Tim,

So if I configure the DAG during the business hours, is there any downtime required for the current production mailbox server ?
IT Team Lead - Unified Communications & Collaboration
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Senior IT System EngineerSenior Systems Engineer
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No you would not have any downtime during business hours building the DAG, however I would wait until after hours to add the members to the DAG and create the Database copies,

Hi Tim,

May I know why need to wait after hours :-o ?
My understanding is that when creating the IPless DAG, the Database copy is not done straight away, or can be scheduled.
Tim EdwardsIT Team Lead - Unified Communications & Collaboration
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Senior IT System EngineerSenior Systems Engineer
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Thanks Tim.

So how to postpone the DAG replication or copy after I added the new & existing mailbox servers ?

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