With memory hot add, you can add memory resources for a virtual machine while that virtual machine is turned on.

Enabling memory hot add produces extra memory overhead on the ESXi host for the virtual machine.

Power off the virtual machine.

Verify that the virtual machine has a guest operating system that supports memory hot add capabilities.

Verify that the virtual machine compatibility is ESXi 4.x and later.

Verify that VMware Tools is installed.


Click Virtual Machines in the VMware Host Client inventory.


Right-click a virtual machine in the list and select Edit settings from the pop-up menu.


On the Virtual Hardware tab, expand Memory, and select Enable to enable adding memory to the virtual machine while it is turned on.


Click Save.