Cloud Computing: Vertical Scalability is Still Your Problem
Published Nov 25, 2008
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Interesting question. I'm not really sure who came up with the concept, but it's been a part of performance definitions since, oh, about 2000 when load balancing really took off and it was discovered that scaling one way did not necessarily affect scaling the other way.
It sounds like you're claiming there's yet another scalability direction. Care to enlighten the rest of us?