Output disk

The output disk is the disk or one of the disks to which FDDRL copies or restores. It is defined using the OVERWRITE-DISK operand in the //COPY-DISK, //COPY-PUBSET, //RELOAD-DISK or //RELOAD-PUBSET command.

The output disk must have the same device type and be formatted in the same way as the input disk or the saved original disk. Only if the output disk is specified with its device mnemonic (MN) FDDRL is able to initialize and format it in advance when required. Otherwise FDDRL accepts the output disk only if it is already installed and has the correct format. Disks of type D3475-8F must be configured and formatted in X2000.

Assignment of the output disk is controlled by means of the OVERWRITE-DISK operand. The following options exist for this:

• OVERWRITE-DISK=*SAME-VSN
  The output disk must have the same VSN as the input disk or the disk which was originally saved to tape. With //COPY-DISK and //COPY-PUBSET, this means that two disks with the same VSN are online. If this is the case, FDDRL checks whether the time stamps of the input and output disks are compatible with the copy direction selected via the ACTION operand. For example, in a run with ACTION=*SAVE, the input disk must be newer than the output disk (see the ACTION operand).

• OVERWRITE-DISK=<vsn 1...6>
  The VSN of the output disk is expressly specified. It cannot be reassigned by the operator.

• OVERWRITE-DISK=*UNIT(UNIT=...)
  The output disk is specified by means of its device mnemonic (MN). It must either have the same MN as the input disk (UNIT=*SAME-UNIT) or an explicitly specified MN. If necessary, FDDRL employs the VOLIN utility routine to initialize and format the disk before it is used. FDDRL ensures that the operations are serialized here.

• OVERWRITE-DISK=*BY-OPERATOR
  The operator is responsible for assigning the correct VSN.

  The operand value *BY-OPERATOR should not be used during normal operation, since an operator error may cause foreign disks to be overwritten inadvertently. *BY-OPERATOR is intended exclusively for cases where the VSN is not known. This situation can occur if a previous COPY-DISK, COPY-PUBSET, RELOAD-DISK or RELOAD-PUBSET run was not terminated correctly. In this case, the SVL still contains a temporary VSN which has been assigned by FDDRL.

Temporary VSN

During restoration, the output disk is assigned a temporary VSN by FDDRL. This consists of the start time (hhmm) and the last two characters of the original VSN. After restoration has been completed, the output disk is assigned the VSN of the input disk or of the saved disk.

If the restoration run is aborted, the output disk retains the temporary VSN. In this way FDDRL prevents the disk which has not been restored completely from being used inadvertently. When the restoration run is repeated, the output disk’s temporary VSN, its MN or the value *BY-OPERATOR must be specified in the OVERWRITE-DISK operand.