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How to patch Windows on Exchange 2010 SP3 servers

Hi,

I have a DAG of six servers. Here is the detail:

2 servers with Cas and Hub
1 Server with Cas, Hub, and Mailbox databases
3 Servers with mailbox databases

All servers are running Exchange 2010 SP3 and Windows Server 2008 R2

I am also running SCCM 2012 as well. I patch my other servers and clients with SCCM 2012 but now I want to patch my Exchange 2010 servers as well in automatic way (if it is possible). If auto is not possible what is the best practice to patch them. I did Google but couldn't find any latest article on it. So here is my requirements:

1. What is the step by step procedure?
2. What's the sequence of actions?
3. Will be there any downtime even disconnection?
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TAMUQITS
Asked:
TAMUQITS
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4 Solutions
 
Simon Butler (Sembee)ConsultantCommented:
Nothing has changed since RTM, so I don't know what you were dismissing from your Google searches. This is a well documented process.
You cannot do it automatically though, it requires manual intervention due to the DAG.

This article by fellow Exchange VMP Paul Cunningham is probably the most comprehensive:
http://exchangeserverpro.com/how-to-install-updates-on-exchange-server-2010-database-
availability-groups/

Simon.
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Ram BalachandranCommented:
Apply in role order
CAS, HUB, UM, MBX
If you have CAS roles in an array/load-balanced, they should all have the same SP/RU level.  so coordinate the Exchange updates and add/remove nodes as needed so you do not run for an extended time with different Exchange levels in the same array.
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Following links have all details to patch Exchange Servers

http://social.technet.microsoft.com/Forums/exchange/en-US/ff206f9c-6e39-4bae-ac1d-1b9d9b465854/best-practices-for-patching-exchange-2010-servers

And

http://windowsitpro.com/configuration-manager/using-microsoft-system-center-2012-configuration-manager-updates
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TAMUQITSAuthor Commented:
Thanks Guys. It's helpful indeed. Though Microsoft claims that switchover will be lossless, is it right 100%?

Second, with reference to my infrastructure, can I update two CAS and HUB server together as or should I update separately then I can update any two servers holding mailbox databases?
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Simon Butler (Sembee)ConsultantCommented:
You should upgrade all CAS and Hub servers before doing any mailbox servers.
Personally I would update one, reboot then do the other. If you have an RPC CAS Array (you should do) and/or load balancer, then you can control which server the clients are using that way.

Simon.
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TAMUQITSAuthor Commented:
Alright,

So you are suggesting that I should update all CAS/HUB servers one by one and once I am done with it; then I can update two servers with mailbox databases at a time, right?
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Simon Butler (Sembee)ConsultantCommented:
Correct. That way if one goes wrong you have others to direct the traffic to.

Simon.
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