GregRoberts2011
Enthusiast
Enthusiast

vCenter - vm resources - disk IOPs

Hi

I want to know if the IOPs resource tuning is true physical IO operations ?

By this i mean that a series of sequential reads can cause a very high logical read rate while the physical disk accesses can be much lower due to cache buffers at various parts of the system.

e.g. two different senarios

a - sequential reads of some flat file can occur if allowed to run free in the 10s to 100s of Ks, lets say 100 logical to 1 physical

b - random reads or writes that require activity on the disk, lets say 1 for 1

What i am concerned about is if i clamp a vm to have 500 IOPs say, will case a) run slowly ?

The backdrop is we occasionally get a vm sucking all the IO out of our SAN which is shared by vCenter, Lab Manager and vCD, because by default these have
"unlimited" for IOPs

Thanks

p.s. interested in an KB / whitepaper which covers this in detail

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