Indicates the total amount of physical memory (in megabytes) installed on the managed system. This number includes both active memory and inactive memory. Active memory includes both memory that was already active on your managed system when it came from the manufacturer and memory that you have activated by using Capacity on Demand. Inactive memory is memory that was included with your managed system, but has not been activated. Inactive memory can be activated permanently (through Capacity Upgrade on Demand), activated temporarily (through On/Off Capacity on Demand), or activated on a trial basis (through Trial Capacity on Demand).