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IIS 6 NLB

Posted on 2012-03-30
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Last Modified: 2012-08-13
So I need to configure an NLB cluster for load balancing IIS.  In my experience, I've set up NLB using exact duplicate servers in terms of hardware and sfotware.  I've simply cloned the first IIS server and used that cloned image to install a second server and then create and configure the NLB cluster.  

Is it absolutely necessary to have a clone for NLB?  How different can the NLB cluster member servers be?  Or how much the same must they be?

Running MS Windows Server 2003 32-bit on both servers.  Wanted to upgrade to 2008 R2 but the sites that IIS hosts would fail.
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Question by:sedberg1
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Ted Bouskill earned 2000 total points
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To be clear, Microsoft has Clustering AND they have NLB as two different features.  I'm assuming you are just using the NLB configured for the network traffic.  If yes, then the machines do not have to be identical.  For example, I had two servers that were used for some internal web applications and I wanted high availability so I used NLB for the key web applications.  If I wanted to upgrade them, I took one offline, upgraded it, then flipped the active computer to the upgraded one, took the other offline and upgraded it then brought both online with no problems.

I also ran some QA/DEV sites on only one of the systems for non-production work.

However, there is a risk upgrading to Windows 2008 R2.  The security settings on R2 are a LOT more restrictive and I see questions on here all the time about sites that were working in IIS 6 that start failing when running in IIS 7 on R2  I'd be sure to try your sites on a test system with the new OS first.
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