Constraints that apply to the hardware

The Server Units of the SE servers exhibit certain differences from the full functional scope of VM2000 due to the hardware architecture, and these differences must be taken into consideration when using VM2000. These are indicated in the following list, and you are referred to relevant sections of the manual for more information.

The SU /390 exhibits the following differences:

• The minimum main memory size and the granularity of the memory allocation is 1 Mbyte (see "Managing main memory").

• The main memory must be at least 512 Mbytes in size for the monitor VM.

The SU x86 exhibits the following differences:

• Hot spare CPUs are not available.
  Cold spare CPUs can be configured, see "Implementation on SU x86".

• On SU x86, X2000 emulates devices with a virtual input/output path for the virtual machines. The functions for VM2000-global reconfiguration (in the BS2000 commands /ATTACH-/DETACH-DEVICE and INCLUDE-/REMOVE-DEVICE-CONNECTION) have no effect.

• Parallel Access Volumes (PAVs, channel device) are not available.
  The inputs/outputs are automatically parallelized by X2000.

• The main memory is managed in multiples of 2 Mbytes (see "Managing main memory"). The main memory of a VM is no longer contiguous.

• The main memory must be at least 1024 Mbytes in size for a VM.