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Exchange 2007 Cluster Design help very needed ?

I have an Exchange 2007 CAS/HUB server with a 2 CCR Mailbox role cluster
servers at my main office.

The company wants be to setup redundancy with a COLO connected with a VPN.
The COLO is on a different subnet. The Active Directory is setup with a PDC
in one site at the main office and the other Domain controller is a Global
Catalog at the COLO, they are both DNS servers in 2 different AD Sites on
the same domain.

I plan to setup a second VPN pipe just for the 10.x heartbeat for the 2
cluster servers to be geographically dispersed  at the  two different

Before I move the passive node cluster server to the COLO and re-IP my cluster I need to confirm with an expert it is the right thing to do;  I hope I am not trying something new that
can't be done. I'm finding difficult to find technet articles and Exchange blogs related  to this design,

I am also planning to add a 2nd CAS\HUB server for redundancy at the COLO as well.

Can anyone tell me how this can be done or they know it can be done ?


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Nitin Gupta
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Are you moving the mailbox server to the second site in the CCR configuration. If so, please check bcos the other site needs to be in the same Ip subnet and in the same Ad site as the first one for CCR to work on windows 2003. (geographically dispersed clusters need to be on the same subnet). Instead you can have a SCR configured.
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Yes, I am moving the mailbox  server to the second site in  the CCR configuration. It will be on a differnet subnet and different AD site in the same domain. I did think MS would design the CCR to be work like that, but I am finding out different. Is my only option is spanning the same AD site and subnet across the VPN from the main office to the COLO.

Exchange is the server side of a collaborative application product that is part of the Microsoft Server infrastructure. Exchange's major features include email, calendaring, contacts and tasks, support for mobile and web-based access to information, and support for data storage.

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