I have 2 CAS/Hub (dual role) servers on Windows Server 2008 R2 that are currently using WNLB to load balance. There is a virtual IP for the CAS array that point to them. I am installing Kemp hardware load balancers but unfortunately I don't have any sort of dev environment to test with. This would all be in the production environment. So, for testing, I figured I would configure the HW LB's and when they are ready I could put in a host file entry on my own machine to point the CAS array and OWA to the new load balancers IP's, leaving the network DNS pointing to the existing WNLB so end users are none the wiser during testing. I realize that this will not be a good test for all services but I could at least test some traffic to and from the HW LB's and of course, that I can get to my mailbox. My ultimate goal is to test the configurations without interrupting production.
So over all, my question would be:
Will using the hardware load balancer while WNLB is active on the CAS servers cause any issues? (i.e. Does anyone foresee any false positive results with this testing that I should look out for? Or will it cause any issues with production?)