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Dynamic VM memory depending on node




I don't think this would be possible, but I figured I'd ask in case there's
a way I just don't know about. 


I'd like to have my Windows 7 VM have 4 GB of memory when it resides in one
node that has limited memory, and have 16 GB of memory when it migrates to
another node that has more memory available.


Somehow I'm afraid I'll be stuck with the lowest common denominator though.


Could someone confirm OpenStack's capability in this regard?