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Using Hardware Load Balancer with existing WNLB

Posted on 2014-02-05
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Last Modified: 2014-02-06
Hello,

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?)
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Question by:ehosford80
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nifdrift earned 500 total points
ID: 39838337
You will have no problem using your hardware load balancer as well as the wnlb.
The wnlb will work standalone just as your hwlb.

You have to configure your hwlb to point to the cashub nodes (dont think about the wnlb ip) and give the hwlb its own ip. This will have no impact on production since Exchange will only "listen" to hostname and since you set hostname to the hwnb ip in your hosts-file the Exchange will treat is as it will treat the wnlb.

Good luck :)

Edit: Remember to set the hostnames of your internal and external addresses in the hosts-file. Also, the failover will not affect each other since they are both standalone. Falover on hwlb will not affect wnlb
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