upgrading exchange 2013 CU7 to CU13 with DAG setup

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.


Thanks
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ITMaster1979Asked:
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AmitConnect With a Mentor IT ArchitectCommented:
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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Scott CSenior Systems EnginerCommented:
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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Todd NelsonSystems EngineerCommented:
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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AmitIT ArchitectCommented:
No downtime required, if you have DAG in place. Share your design. I will write the steps for you.
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ITMaster1979Author Commented:
Hi Amit

I have two servers mail1, mail2 in single DAG, both are located in different locations.
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AmitIT ArchitectCommented:
Do you have hlb?
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ITMaster1979Author Commented:
two server are running Mailbox and Hub, yes I have hardware load balancer
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AmitIT ArchitectCommented:
Good, you have HLB...is this active/passive design or active/active.
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ITMaster1979Author Commented:
active/passive
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AmitIT ArchitectCommented:
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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ITMaster1979Author Commented:
yes I did
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ITMaster1979Author Commented:
Thanks
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AmitIT ArchitectCommented:
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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AmitIT ArchitectCommented:
As per user request, best answer provided.
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