Updating Exchange 2013 Cu6

Its exchange 2013.
We are having 3 Mailbox Serves and 3 CAS servers. One CAS and one Mailbox at DR site as well.  There is DAG.

How can we update CU6 ? what will be the best practice ?
ucguyAsked:
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Hello WorldConnect With a Mentor Commented:
Hi,

I agree with suriyaehnop, we have to setup Exchange server with maintenance mode when install update with DAG.
We can use the Exchange 2013 Setup wizard to upgrade your current version of Exchange 2013, please refer to Installing update with DAG members section:
https://technet.microsoft.com/en-us/library/dd298065%28v=exchg.150%29.aspx#In

Besides, Microsoft recommend that install update on CAS server first, then MBX.
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suriyaehnopConnect With a Mentor Commented:
Exchange 2013 require to Set-ServerComponentState before applying any update.

Exchange 2013 Maintenance mode:


http://blogs.technet.com/b/nawar/archive/2014/03/30/exchange-2013-maintenance-mode.aspx

https://technet.microsoft.com/en-us/library/dd298065%28v=exchg.150%29.aspx
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ucguyAuthor Commented:
Is there any prepared task plan ?
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Jay ShawnCommented:
Hi ucguy....
This is a very common issue, you can easily update cu6 having 3 mailbox server & 3 CAS server.
The Link given below shows you the simplest way for updating cu6.

http://msexchangeguru.com/2014/08/28/e2013cu6installation/
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