I did try Windows Clustering at one point but gave it up for various reasons.
I guess you need to determine the Fail Over type - Extending specific service, by adding additional modules is not only used for Load Balancing - this also provides a fail over option and you can get adjust the settings to limit processing on the extensions so that they’re mainly there for fail over purposes.
You obviously don’t want to replicate everything - but take care how you handle the CMS and Input / Output services etc.
I have created an Active - Passive node setup - 2 separate servers / sharing the same CMS - with no Load Balancing, using a Perl script to activate the Passive node if the current Active node fails.
This was faclitated via a Cisco Router so as not to confuse the user.
I will see if I can upload a diagram that I have that shows how it’s enabled.
MikeD 
(BOB member since 2002-06-18)