Site Failover and Hub Transport query

jasonwatts1972 used Ask the Experts™

I am learning about SCR in Exchange 2007 and DR, and there is one thing I'm not sure on.

We have one campus (AD site), which has two Data Centre rooms, DC1 and DC2. They both have a CCR cluster each and an SCR target each. So DC1 CCR has SCR copy to the DC2 SCR target etc.

Question - if DC1 goes down, then we would activate the SCR target for DC1_CCR which is in DC2. This takes care of the mailbox side of things, but how about the Hub/CAS servers, how can we prevent connections going to them?

For the Hub, would we need to pause the Transport service or the Queues in any way?

And what about the CAS?

I guess if we had both DC's in a seperate AD site, that would have helped?
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what is the status of the CAS server(s) @ both the sites should be a point to consider.

If the CAS @ site-1 is still available (and also internet facing), then if the mailboxes gets mounted @ site-2 will force the CAS@site-1 to proxy all of the requests to the "CAS @ site-2"

In case if all the servers @ site-1 are down....need to worry about the internet presence.
We may need to the change the public-DNS to resolve the name to the "CAS @ site-2" and also ensure that the "External URLs" for OWA,EAS are populated.

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