How to Migrate your Environment to z/VM HCD

To manage the I/O configuration with HCD under z/VM, you have the following options:

• You can use the provided REXX utilities to perform z/VM HCD tasks.
• You can use HCM as a graphical user interface to z/VM HCD. Therefore, you must load the HCD IODF into an HCM configuration file. For more information, refer to the z/OS and z/VM Hardware Configuration Manager User's Guide.
• You can decide to manage your operating system configuration in addition to the hardware, or you can use HCD just to manage your hardware I/O configuration.

  If you want to use HCD to also control the operating system I/O configuration under z/VM, you have to define an operating system of type VM in the IODF, assign the appropriate devices to the VM operating system, and define the VM consoles.

As prerequisite for managing your I/O configuration with HCD, you need an IODF belonging to z/VM HCD. This document describes the steps how to produce an IODF from an IOCP deck.

The IODF contains the logical I/O configuration definitions that are required for writing an IOCDS, for building the RDEV control blocks at IPL time, and for dynamic hardware and software changes.

An HCM configuration file is always strongly associated to a specific IODF and contains logical data from this IODF as well as additional data on physical I/O configuration aspects. Thus, it contains all data that is necessary to show an I/O configuration diagram from the physical configuration point of view.

If z/OS is used in your environment, you already have an IODF file. It is then recommended to define the I/O configuration under z/OS HCD, if you decided to manage your z/VM configuration using HCD. Thus, the hardware configuration for both the z/OS and z/VM systems can be managed from a central place.

You should read Migration Scenarios to z/VM HCD for z/VM and z/OS if you are interested in migrating to HCD in a z/VM environment without z/OS, or migrating to HCD in a mixed z/VM and z/OS environment (this includes information on how to exchange IODF or IOCP files between z/VM and z/OS).

On z/VM, the user ID that is used for HCD/HCM is CBDIODSP. This user ID is the z/VM HCD TCP/IP dispatcher. The work and production IODF files are stored on the 191 disk. The z/VM HCD/HCM production files are on the 400 disk. These include the CBDSxxxx REXX utilities.