Managing main memory

	On SU /390, VM2000 manages the Server Unit’s real main memory. VM2000 addresses the available main memory starting at 0. This addressing is known as the absolute addressing of VM2000. The absolute address 0 of VM2000 thus refers to the start of the main memory available for VM2000 operation.
	When a VM is initialized on SU x86, a share of the Server Unit’s main memory is made available to the VM, see "Implementation on SU x86".

The guest systems of every VM use addressing which is relative to the start of the main memory which is assigned to them. This addressing is known as the absolute addressing of the VM. The absolute address 0 of a VM thus refers to the beginning of the VM's main memory.

VM2000 manages real main memory and domains of up to 1 Tbyte
(terabyte; 1 Tbyte = 1024 Gbytes = 1 048 576 Mbytes).

Accounting for main memory

Main memory usage (MEMORY-SIZE) is shown in the VM2000 accounting record for the VM. A VM accounting record is written after a main memory reconfiguration has been completed successfully or when the VM is terminated (see "Accounting record for a VM").