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Well 5ms of disk latency could certainly impact CPU as well. However, when you have 2-3 %RDY I would not be worried, for the number of VMs and vCPUs you are running that is relatively low. Note that when you have 8 vCPUs you have to divide 3% by 8, and then you have the per vCPU %RDY, which is extremely low in your case.

My article explains this, and also this comment on the article: http://www.yellow-bricks.com/2010/01/05/esxtop-valuesthresholds/#comment-5861

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