Hot add of cpu and memory to a virtual machine in vcenter

Why can't you hot add cpu or memory to you esxi host's vm?
Is the option grayed out?


Reason: in vsphere by default a  virtual machine has it's hot add options turned off
















How to enable hot add:
1. You have to power off the vm, no choice here if the option is not enabled.
2. Edit Vm Settings-> options-> Memory/cpu hotplug
3. Click on enable for both options. You can see hot remove is not selectable, that is because the os of the vm doesn’t support it.









Test of hot add of cpu and ram
*your operating system has to support hot add




Before hot add 1 cpu and 2gb ram









Hot add cpu
You can add sockets NOT cores





























Hot add Ram
As you can see I cannot go below the current 2gb
















The ram changed to 8gb