I have 7 Exchange servers in my environemnt all running Exch 2010 SP1 at different sites in same domain- trust enabled. All the Exchange servers are holding Client Access, Mailbox and Hub transport roles, means we have setup the exchange with multi-role solutions.
As per the Article http://technet.microsoft.com/en-us/library/bb629560.aspx
"" Do not upgrade any Mailbox servers from one version to another until all Client Access servers within the Active Directory site have been upgraded to the target version." and article http://blogs.technet.com/b/exchange/archive/2010/07/22/3410475.aspx
""the fact that all of the Client Access role servers will be identified as part of the CAS array in a given Active Directory site (this is automatic). ""
Problem is I cant upgrade all the CAS servers at one go as it affects the bussiness.
With out changing the design say " changing the server roles and re-design" is it possible to upgrade the SP on the servers.
Current design overview:
Site 1 - Exchange server1
Site 2 - Exchange server2
Site 3 - Exchange server3
Site 4- Exchange server4, 5, 6 and 7
Here Exchange server 1, 2, 3 has the Mailbox database shared (copied) on local servers also on site 4 Exchange servers. Means we have mounted mailboxes on two servers for redundancy.
Initially I thought of upgrading sp on sessions wise, doing Site 1 upgrade at one and wait until I get no issues confirmation and proceed with other sites. But after reading the articles I cant proceed as I need to upgrade all the servers at one go because of opting multi-role solutions.
Appreciate for quick response and happy to provide more information.