CAS Array Fail over Powershell Script for switching when DAG moves to new Server

All,

What i am trying to accomplish:

I have 3 exchange 2010 servers setup in a DAG with Hub, Transport, and CAS installed
Each one is in their own site.
I created a CAS array group in each site casarray1.domain.local, casarray2.domain.local, casarray3.domain.local

Each one is set up in DNS with their respective IP.

When a server goes offline the DAG switches to the next server in line, but the casarray needs to be manually switched in order for mail to route outbound correctly.  Is there a script or way to automate so when a server fails everything gets switched for the CAS array and cluster group?  I dont mind a manual fail back just need an automatic fail over. Any other ideas or options would be great.
AFRITSupportAsked:
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Simon Butler (Sembee)ConsultantCommented:
That is what a load balancer does.
You can use an open source one if you wish - such as Zen.

Another option would be to write a script that does a ping test of the CAS role holder, if that fails then use the command line to change the DNS record.

The CAS Array address should be used for MAPI traffic only. Mail flow in general shouldn't be using the CAS Array address.

Simon.
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AFRITSupportAuthor Commented:
i like your script idea, do you have any guidance for that?
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Simon Butler (Sembee)ConsultantCommented:
The only script sample I have I cannot share as it belongs to a client. Sorry.

Simon.
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