VM2000 is characterized by the following features:
Concurrent execution of up to 32 BS2000 guest systems on a single Server Unit.
Guest systems can be the operating systems released for this VM2000 version (see "Supported hardware and operating systems").
The guest systems are completely independent of one another.
it is not possible to access memory areas of other guest systems.
errors within one guest system - even if they result in a system crash - are of no relevance for the other guest systems.
Scope of functions identical to that of BS2000 native operation.
The functionality of guest systems running under VM2000 corresponds to BS2000 native operation as far as the command set, the data communication capability in networks, and the debugging and diagnostic aids are concerned.
For accounting purposes, the job accounting data of every guest system can be centrally collated.
Performance almost the same as BS2000 operation without VM2000.
The performance of the guest systems under VM2000 is similar to that of native operation. The excellent performance values are a result of the following measures:The guest systems execute directly on the host, i.e. only one minor emulation is required.
Memory areas are permanently assigned to a given guest system (thus eliminating the need for additional address translation).
The devices are assigned to the guest system, i.e. no additional loss in performance results from device management in VM2000.
Further information on the use of VM2000 in terms of performance is provided in the “Performance Handbook” [18].