troubleshooting Question

Exchange 2010 File share witness

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anarineFlag for Trinidad and Tobago asked on
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I've read in numerous articles that a File share witness vote is used for achieving majority node set whenever there is an even number of members in the Exchange 2010 DAG.

So let's say I have 2 Sites - Site A and Site B and a 6 node DAG.
Site A - has 4 mailbox servers
Site B - has 2 mailbox servers.
Suppose Site B fails.
By MNS, (6/2 + 1) = 4 which is the majority (more than half). So quorum is not lost and
the cluster continues to function on Site A. In this case we would not need the FSW?
So then it may not be correct to say that the file share witness is needed when there is an even number of members in the DAG ?

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