Defining operating system configurations

It is recommended to define the operating system configuration before you define anything else. Proceed as follows to define an operating system configuration:

1. On the Primary Task Selection panel, select Define, modify, or view configuration data and on the resulting panel the object Operating system configurations. HCD displays the Operating System Configuration List of all operating system configurations currently defined in the IODF:
   Figure 43. Operating System Configuration List

     Goto  Backup  Query  Help
    --------------------------------------------------------------------------
                       Operating System Configuration List              Row 1 of 8
    Command ===> ___________________________________________ Scroll ===> CSR
   
    Select one or more operating system configurations, then press Enter. To
    add, use F11.
   
    / Config. ID  Type     Gen  Description                      D/R site OS ID
    _ DRMVSA      MVS      Yes  generated from MVSA
    _ DRMVSB      MVS      Yes  generated from MVSB
    _ DRMVSC      MVS      Yes  generated from MVSC
    _ DRMVSE      MVS      Yes  generated from MVSE
    _ MVSA        MVS           ________________________________ DRMVSA
    _ MVSB        MVS           ________________________________ DRMVSB
    _ MVSC        MVS           ________________________________ DRMVSC
    _ MVSE        MVS           ________________________________ DRMVSE
    ******************************* Bottom of data ********************************

   If there are no existing configurations in the IODF, the operating system configuration list is empty.

2. Use F11=Add to define a new configuration. The data-entry fields are shown in the following figure, with sample data:

      *---------------- Add Operating System Configuration --------------*
      |                                                                  |
      | Specify or revise the following values.                          |
      |                                                                  |
      | OS configuration ID  . . . . . MVSD____                          |
      | Operating system type  . . . . MVS       +                       |
      |                                                                  |
      | Description  . . . . . . . . . z/OS operating system             |
      |                                                                  |
      | OS config ID for D/R site  . . DRMVSD__  (generated for GDPS)    |
      |                                                                  |
      *------------------------------------------------------------------*

3. After you press the Enter key, HCD displays the updated Operating System Configuration List.

D/R site OS configurations

You can optionally type the name of a disaster recovery (D/R) site operating system configuration into the OS config ID for D/R site field. You need a D/R site OS configuration in a GDPS managed environment, where storage devices are mirrored over peer-to-peer remote copy (PPRC) connections in order to have a backup system defined for an emergency situation.

During the Build production I/O definition file or Build validated work I/O definition file tasks, the named D/R site OS configuration is automatically created as copy of the primary OS configuration. The resulting OS configuration is called generated OS configuration. It has all DUPLEX defined storage devices, that are classified by PPRC usage type DUPLEX, attached with reversed OFFLINE parameter value. That is, if the primary OS configuration specifies OFFLINE=NO, the D/R site OS configuration attaches the devices with OFFLINE=YES and vice versa.

Following rules apply to generated D/R site OS configurations:

• A generated OS configuration is re-created with every Build production I/O definition file or Build validated work I/O definition file from its primary OS configuration.
• With any kind of changes done to a D/R site OS configuration, (for example, modifying device-to-operating-system-relations, or changing EDT definitions), it loses its generated status. It is not automatically re-created with the next Build production IODF, so that the user modifications are preserved. To let it generate again from the primary site OS configuration, you must delete the modified D/R site OS first or specify profile option UNCOND_GENERATE_DROS=YES.

  However, changing the description of a D/R site OS configuration does not change its generated status.

• You cannot specify the name of a D/R site OS configuration for a generated OS configuration.

The generated status of an OS configuration is shown in column Gen in the Operating System Configuration List (Figure 43).