Splitting an ISA 2006 Array

Scenario: I have two ISA 2006 servers (Windows Server 2003 R2 Std) setup in an array. The ISA servers are acting as a perimeter firewall to our Internet connection.

We are migrating to a new Internet connection but need to keep the existing Internet service running during the process. My thought is that if it is possible I would like to split the Array so we could remove one of the ISA servers and leave the other in-place running the current service (I appreciate we will lose resilience during this process). Once split I would take the other ISA server and configure it for the new connection and then transfer the services we run through the old connection over to the new in a controlled manner. Once all services had been moved I would want to take the old ISA server and connect it back as an Array on the new link.

Questions:

1) Is this possible?
2) Anyone done this and can advise the process and thinks to watch out for?
3) Is there a better way?  (I'm trying not to have to buy new servers but just use existing ones)
AWGMorrisonAsked:
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Keith AlabasterConnect With a Mentor Enterprise ArchitectCommented:
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Keith AlabasterEnterprise ArchitectCommented:
To be blunt, it is as simplistic - and straight-forward as it sounds. However, once of the nodes has been shutdown I would reinstall it from scratch including OS and give it a new netbios name and join it to the domain with NLB implemented. Then do the same for the remaining node at the appropriate time.

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AWGMorrisonAuthor Commented:
Thanks Keith. Are you saying just to switch one of the servers off? or is there a process for removing a server from the Array cleanly?
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AWGMorrisonAuthor Commented:
Keith - Thanks for you advice.
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Keith AlabasterEnterprise ArchitectCommented:
Welcome :)
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