z/VM-related considerations

HCD allows the definition of VM operating systems and their devices including their VM-specific parameters. This is triggered by the "operating system type - VM" when defining an operating system. Figure 146 shows the panel where you can enter the operating system type.

Figure 146. Define a VM operating system

*---------------- Add Operating System Configuration -----------------*
|                                                                     |
|                                                                     |
| Specify or revise the following values.                             |
|                                                                     |
| OS configuration ID  . . . . . OPSYS02_                             |
| Operating system type  . . . . VM        +                          |
|                                                                     |
| Description  . . . . . . . . . z/VM operating system                |
|                                                                     |
| OS config ID for D/R site  . . ________  (generated for GDPS)       |
|                                                                     |
|  F1=Help    F2=Split   F3=Exit    F4=Prompt  F5=Reset   F9=Swap     |
| F12=Cancel                                                          |
*---------------------------------------------------------------------*

When you attach a device to a VM operating system, the Define Device Parameters / Features panel displays the operating system-specific parameters. See Figure 147 for an example of attaching a device to a VM operating system.

Figure 147. Define Device Parameters/Features for VM Device

*--------------------- Define Device Parameters / Features ------------------*
|                                                               Row 1 of 5   |
|                                                                            |
| Specify or revise the values below.                                        |
|                                                                            |
| Configuration ID . : OPSYS02      z/VM operating system                    |
| Device number  . . : 0100         Number of devices  : 1                   |
| Device type  . . . : 3390                                                  |
|                                                                            |
| Parameter/                                                                 |
| Feature     Value +          R Description                                 |
| OFFLINE     No                 Device considered online or offline at IPL  |
| SHARED      ________________   Device shared between multiple real systems |
| UIRATE      DEFAULT            Hot I/O Recovery Rate                       |
| MDC         DFLTON             Device to be cached in minidisk cache       |
| EQID        ________________   Device equivalency ID                       |
*----------------------------------------------------------------------------*

In a mixed environment, running a z/OS system in one partition and z/VM in another partition, any change of the VM definitions (for example, add a device) can be done without a POR for the processor. The Dynamic I/O Reconfiguration function for the hardware can be used to add this device to the Channel Subsystem (CSS). In a second step, a device can be set online dynamically. You do not have to IPL the z/VM system image. For more details refer to z/VM CP Planning and Administration.

If you are running z/OS and z/VM on separate processors, you can configure both systems with HCD in the same IODF. You can export the IODF to the z/VM system and activate it there using z/VM HCD. See z/VM: I/O Configuration for more details.