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upgrading exchange 2013 CU7 to CU13 with DAG setup

Posted on 2016-09-30
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Last Modified: 2016-10-25
Dear All,

  I have two Exchange 2013 CU 7 in DAG setup, I want to update them to CU 13 with minimum downtime, please advise as I have DAG in the setup.


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Question by:ITMaster1979
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Expert Comment

by:Scott C
ID: 41823320
Anytime you upgrade Exchange, there will be some downtime.  You will just have to plan it so it will impact your users minimally.   Weekends, afterhours, etc.

As you have a DAG there will, however be some extra considerations.

Look through this blog.

https://blogs.technet.microsoft.com/nawar/2014/03/30/exchange-2013-maintenance-mode/

I know it's a lot of steps, but follow this and things should go smoothly.
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Expert Comment

by:Todd Nelson
ID: 41823397
This is a great reference that explains the updating process for Exchange in a multi-server environment; and includes DAGs.

http://exchangeserverpro.com/exchange-2013-installing-cumulative-updates/

FYI... Exchange 2013 CU14 was released on 20 Sep 2016.
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by:Amit
ID: 41823606
No downtime required, if you have DAG in place. Share your design. I will write the steps for you.
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by:ITMaster1979
ID: 41824961
Hi Amit

I have two servers mail1, mail2 in single DAG, both are located in different locations.
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Expert Comment

by:Amit
ID: 41825551
Do you have hlb?
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Author Comment

by:ITMaster1979
ID: 41825576
two server are running Mailbox and Hub, yes I have hardware load balancer
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Expert Comment

by:Amit
ID: 41825844
Good, you have HLB...is this active/passive design or active/active.
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by:ITMaster1979
ID: 41826883
active/passive
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Expert Comment

by:Amit
ID: 41826998
You can patch Passive first, then failover to passive site and patch prod server and failback. Have you ever done failover to passive site?
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by:ITMaster1979
ID: 41830222
yes I did
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Accepted Solution

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Amit earned 500 total points (awarded by participants)
ID: 41830251
Good, then you can do the patching during off hours or as per your change process. Make sure to take full backup before you start the patching.

Steps:
1) First patch Passive site
2) Failover
3) Patch Primary Site server, which will be in passive mode.
4) Finally, failback and perform all testing. like connecting outlook, OWA, send/rec mails etc.
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by:ITMaster1979
ID: 41831122
Thanks
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by:Amit
ID: 41831693
Also, copy Bin folder at safe location, in case you have any OWA or IIS customization. Take screenshots for any custom setting in advance. Sometimes, it can revert back to default. If no custom setting, then you can ignore it, however I still suggest to do it.
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by:Amit
ID: 41858235
As per user request, best answer provided.
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