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

About this task

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.


  1. Click Virtual Machines in the VMware Host Client inventory.
  2. Right-click a virtual machine in the list and select Edit settings from the pop-up menu.
  3. On the Virtual Hardware tab, expand Memory, and select Enable to enable adding memory to the virtual machine while it is turned on.
  4. Click Save.