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upgrade exchange 2013 CU3 DAG to CU 7

Hi All
 Im planning to migrate my Two exchange 2013 CU3 in DAG to CU 7, I plan to start in the passive server as its recommended my question is can I upgrade my passive server and keep it for 4 days before upgrading the active server,


Thanks
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ITMaster1979
Asked:
ITMaster1979
4 Solutions
 
Andy MInternal Systems ManagerCommented:
Although in theory it should be possible I don't believe it's recommended to have both servers running different CU's for a large period of time as it could cause issues. If it was a difference between CU6 and CU7 I'd probably say it wouldn't be too bad but there's a large number of fixes between CU3 and CU7 - some of which may cause issues.

Personally I'd try to get both done as close together as possible. I recently had to upgrade ours to CU7 from CU6 but did encounter a number of errors when trying to do the passive first but once I upgraded the active/primary server the passive took the upgrade without any problems.
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Simon Butler (Sembee)ConsultantCommented:
If you don't upgrade the second server to CU7 then you will be unable to complete failover.
So updating the passive will be fine. However if that server then becomes the active, you will be unable to fail back to the other server (with CU3) as you cannot failover to an older version.
What I usually do is failover the "primary" server, then patch it. Fail back and patch the previously passive server.

Simon.
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ITMaster1979Author Commented:
Ok so, my plan is to make sure that all the databases are mounted and active in the primary server, then patch the passive after putting it in maintenance mode, then move the databases to the passive and patch the primary , is that ok?
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Simon Butler (Sembee)ConsultantCommented:
That should work fine. Remember that once you have failed over to the newly patched server you cannot fail back until it too has been patched.

Simon.
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AmitIT ArchitectCommented:
I assume you know how to move server into maintenance mode for such task. If not, check this.

http://www.proexchange.be/blogs/exchange2013/archive/2012/11/10/script-putting-exchange-server-2013-into-maintenance-mode.aspx
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ITMaster1979Author Commented:
GOOD
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