Turn off the virtual server. Open the "Virtual Machine
Properties" panel by right-clicking on the virtual server, and go to the
"Options" tab.
Select the "Memory/CPU Hotplug" option on the left
pane. Select "Enable Memory hot add for this virtual machine" and
press "OK."
Right-click on the Virtual Machine and select "Virtual
Machine Properties." Go to the "Hardware" tab and select
"Memory" on the left tab.
Change the amount of memory on the right tab when the
Virtual Machine needs it.
