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Why is NLB incompatible with Failover Clustering?

Posted on 2011-10-13
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Last Modified: 2012-05-12
Hi Guys,

I've read the following article which says can't have NLB on servers with Exchange DAG because of known issues:

http://technet.microsoft.com/en-us/library/dd979781.aspx#Two

But I can't find what theses issues are.

Do you know?
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Question by:garconer
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Expert Comment

by:Akhater
ID: 36962594
simply these 2 roles are not compatible windows wise.

Both Clustering and NLB will require to interact with the network layer and thus both roles cannot run on the same machine at the same time
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Author Comment

by:garconer
ID: 36962682
Actually it works but it is not supported. I do want to understand the technical issues that directs Microsoft on not supporting this.
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LVL 49

Expert Comment

by:Akhater
ID: 36963074
Well as far as i know they cant be installed on the same server
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Author Comment

by:garconer
ID: 36963468
If you have more than 1 nic, you can do it.
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Accepted Solution

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Akhater earned 2000 total points
ID: 36963571
never tried it but if you say so I trust you did.

What is exactly the question ? why is it not supported ? I already told you that both services interact with the network layer in totally different ways
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Author Closing Comment

by:garconer
ID: 36963658
Tkanks for your answer.
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