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query on VM reservation

hi

 

I have an SAP application on vapp which has set specified VM reservation (both MEM /CPU )

 

mem/cpu reservation set to 20GB/2GHZ

 

I wanted to know what impact can happen to application if

 

a) i remove the memory reservation  -- what is the impact here?

b) remove CPU reservation              -- what is the impact here?

c) both memory / CPU reservation -- what is the impact here?

 

what all operations does ESX do when mem/cpu reservation is not set

Will my application become slower because many such VMs would cause ESX to spend more time in mem/cpu (correct me pls)

 

thanks

srini


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