When operating a Server Unit with VM2000, various constraints and limitations have to be taken into account that do not apply in native operation. These are indicated in the following list, and you are referred to relevant sections of the manual for more information.
The following constraints apply to the hardware:
For interactive operation in the guest system, the hardware connection conditions specified by BCAM must be met for each guest system (BCAM is the central component of the software product openNet Server). These restrictions can vary depending on the version of the guest system.
The assignment of the peripherals to the VMs should be planned carefully to ensure that performance is not impaired (see section "Notes on configuration for VM2000 operation").
The following constraints apply to the software:
The parameters for VM2000 are set using the startup parameter service, the parameter file of the VM2-MON subsystem and (on SU /390) the configuration file of the monitor VM (see "Setting the VM2000 parameters in the parameter service").
A guest system cannot be started by an IPL device that is shared, i.e. in
SHAREDusage mode (see "Starting the guest system on a VM").The "Channel Subsystem Monitoring Facility" function (SU /390) for recording detailed device-specific operating times using the performance measurement monitor openSM2 (monitoring program SERVICETIME) can only be enabled for one guest system. If the monitoring program SERVICETIME is started on another guest system, no measurement data is supplied for this guest system (see "Measurement with the openSM2 measurement monitor").
For shareable devices that are assigned to more than one VM (
SH(I)usage mode), the Channel Subsystem Monitoring Facility (SU /390) is not activated. The openSM2 performance measurement monitor does not receive any measurement data for these devices (see "Measurement with the openSM2 measurement monitor").The BS2000 command
/WRITE-IOCF(SU /390) can only be executed in the monitor system.
The following software prerequisites may need to be satisfied:
A prerequisite for using VM2000 on an SU /390 is the software product REWAS in the monitor system.
A prerequisite for working with job variables is the software product JV in the monitor system. See "Monitoring a VM with job variables (MONJV)" and "Reconfiguring main memory".
If the clone units of a pubset are to be used for the pubset assignment to a VM, the software product SHC-OSD is required in the monitor system, see "Mirror pubsets".
The software product SECOS is required for assigning privileges to a user task (which is not TSOS) in the monitor system, see "Privileges of the user task in the monitor system".
The software product OMNIS is recommended when the guest system is operated via $VMCONS or logical consoles are used, see "Establishing a connection to $VMCONS" and "Operating the guest systems using logical consoles".