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Update CU DAG Servers Exchange 2013

Hello gents

I have a question . I need a clear step by step Guide of how to Update an Exchange DAG Mailbox . Knowing that The servers have the following :
MBX01 is in .NET 4.5.2
MBX02 is in .NET 4.5.1

CU12 is my current CU

My servers are Exchange 2013 and i want to go to CU20 the current One . Please i See a lot of Informations . I need a clear step by step to accomplish this task . I understand the whole process but the place where i have to move databases is a bit confusing from active to passive
Rgds

timgreen7077

Basically you will need to put serverA into maintenance mode which will include moving the active databases to the serverB that you are not upgrading yet. Once serverA is upgraded you will take serverA out of maintenance mode and move the active DB to serverA from serverB and start putting serverB in maintenance mode. I have pasted a link that shows you step by step about how to put the servers in maintenance mode and how to take them out of maintenance once the upgrade is complete and how to confirm its no longer in maintenance mode. Part of maintenance mode is dealing with the active DBs and the instructions in the link will address it.

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

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viktor grant

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Gaston Mbey

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Thx for the reference