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CPU assignment for VM host

AXISHK asked
Last Modified: 2015-03-25
From an article,
"if each virtual machine you create has a 500MHz reservation and your host has 6000MHz of CPU capacity, you can deploy no more than 12 virtual machine (500MHz x 12 = 6000MHz) even if all of them are idle. However each virtual machine is not limited to 500MHz and ESX/ESXi host will schedule more clock cycles to VM if needed."

Suppose my VM host has 2 CPU 2.1GHz with 6 cores, ie 12 cores.  Can I say each VM guest can only asssign with CPU of 2 and cores per socket of 6 ? Should I set the CPU Limit (say, 500MHz) to ensure a single core can be shared by several few VMs ?

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