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Do members of a Microsoft Cluster need to have identical amounts of RAM?

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Last Modified: 2008-08-28
I know that MS *recommends" identical server hardware for cluster nodes... but is it really *required* for them to have identical amounts of RAM?  What are the possible issues if they do not?

We have an existing MS cluster, and some of the RAM in one node is failing. We have replacement memory, but the amount will not be identical to the other server. The replacement will actually INCREASE the amount of RAM.  Is this a problem?
Thanks!
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