Memory hot add lets you add memory resources for a virtual machine while the machine is powered on.

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

Power off the virtual machine.

Ensure that the virtual machine has a guest operating system that supports memory hot add functionality.

Ensure that the virtual machine is using hardware version 7 or later.

Ensure that VMware Tools is installed.


Select a virtual machine.

In the virtual machines and templates inventory tree, select a group of virtual machines and select a virtual machine from the list on the right.

Search for a virtual machine and select it from the search results list.


In the VM Hardware panel, click Edit Settings.


Click Virtual Hardware.


Click the Memory triangle to expand the memory options.


Select Enable to enable adding memory to the virtual machine while it is powered on.


Click OK.