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

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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bereanbs
Asked:
bereanbs
2 Solutions
 
Guy Hengel [angelIII / a3]Billing EngineerCommented:
it is not required. the problem you can get, is when the nodes fail over to the server with less RAM, that this will lead to (more/excessive) paging, and hence slowing down the entire system.
now, if all the dimensioning has been done with nodes with "low" RAM, and you now place/upgrade 1 node with more RAM, this will not be a problem at all.
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LauraEHunterMVPCommented:
As you say, identical hardware is -recommended-.  In the case of RAM amounts, the only obvious issue you'll notice is that, if the cluster fails over to the node with less RAM, performance will be impacted.

It's worth testing any applications that are running on the cluster to see if there are any app-specific issues that you'll encounter, but from an operating system standpoint I can't think of anything aside from the perf issue.
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