System Setup › Define Virtual Devices Using IBM's Hardware Configuration and Definition (HCD) Dialogs

Define Virtual Devices Using IBM's Hardware Configuration and Definition (HCD) Dialogs

A primary and alternate set of Virtual Devices must be defined. The primary set will be used for virtual tape processing. The alternate set will be available in case of a permanent failure of the primary set that can only be cleared by an IPL.

To define the Virtual Devices to the operating system, follow the Define I/O Device Data procedure in the IBM HCD User's Guide with the following changes:

1. The Virtual Devices must be defined as 3480s or 3490s because CA Vtape emulates these tape device types.
2. The devices will not be defined with control units (CUs) or channel paths (CHPIDs) because they are software devices.
3. On the Define Device Parameters/Features screen, make sure that Autoswitch is No, Dynamic is Yes, Sharable is No, and Compact is Yes.
4. Add the newly defined Virtual Devices to new or existing esoterics for which virtual mounts are desired. We recommend that existing esoterics be updated to avoid JCL changes.
5. Follow the Build a Production IODF procedure in the IBM HCD User's Guide to verify your changes and create a new production IODF.
6. Activate the new devices dynamically (software change) for testing.
7. Update SYS1.PARMLIB to reference the new IODF to retain the changes across IPLs.

Note: This information was developed from the IBM z/OS V1R13.0 HCD User's Guide. Any change to the HCD software or the HCD User's Guide may invalidate this information.

The primary and alternate set of devices defined will be entered into the OSDRIVE and VTDRALT parmlib members. For more information, see the section Initial Configuration of the Parmlib.