If more than one volume is required for a save entity, the volumes are combined to form a so-called MAREN tape set. The volumes of a tape set are identified by the following characteristics:
They all have the same file name (FILE-NAME).
For all volumes, the FIRST-VOLUME field contains the VSN of the first volume in the tape set.
The sequence of the volumes in the tape set is based on ascending VOLUME-SEQUENCE (0001 – 0255) and ascending CREATION-DATE and CREATION-TIME.
At the end of a save, all volumes of the tape set are marked as valid with the CLOSE-INDICATOR=CLOSED attribute. Here the number of tape blocks that are written are transferred to MAREN as well. The first volume of a tape set is marked as valid only after the save has been completed successfully. The first volume of a tape set consequently indicates the successful creation of all volumes of a tape set.
MAREN file name during save
By default, FDDRL forms the file name (FILE-NAME) in the MAREN catalog as follows:
For the single disk save entity
FDDRL.D.<vsn_1..6> in the case of
//DUMP-DISKFDDRL.P.<catid_1..4>.<vsn_6..6> in the case of
//DUMP-PUBSET
For the disk set save entity
FDDRL.D.<vsn_1..6>-1 in the case of
//DUMP-DISKFDDRL.P.<catid_1..4>.<date>.<time>-<disk-set-no> in the case of
//DUMP-PUBSET
with the following meanings:
| FDDRL.P | Prefix for the backup of a pubset disk (in the case of DUMP-PUBSET) |
| FDDRL.D | Prefix for the backup of single disks |
| <catid_1..4> | Pubset-ID, 1- bis 4-stellig (Katalogkennung) |
| <vsn_6..6> | VSN of a pubset disk, 6 characters |
| <vsn_1..6> | VSN of an individual disk, 1-6 characters |
| <date> | Date of the save (format yyyy-mm-dd) |
| <time> | Time of the save (format hhmm00) |
| <disk-set-no> | Number of the disk set (depends on NUMBER-OF-DISK-SETS) |
Free tape allocation facility (MARENUCP) and MAREN file name (FILE-NAME)
If the TAPE=*ANY operand is specified for a save, MARENUCP reserves free volumes and assigns these. The volumes are then assigned the previously defined file names in the MAREN catalog entries.
MAREN file name during restoration
When disks are restored, the tapes required can be determined automatically using MAREN. To permit this, the user specifies the MAREN file name.
In the case of RELOAD-DISK, the save version can also be selected. In the case of RELOAD-PUBSET, the save version is selected implicitly by means of the save time (DATE and TIME operands) contained in the file name.
If the user does not specify a MAREN file name for restoration, FDDRL creates a file name. This has no relation to MAREN or the user labels, but is merely used for information purposes (in the message NKVT013 and in the job log). FDDRL creates the file name both during restoration and saving (for information on name creation and the meaning of the name parts, see MAREN filename during save), the following exceptions applying here:
FDDRL.P.<catid_1..4>-1 in the case of
//RELOAD-PUBSETduring job creationFDDRL.D.<vsn_1..6> in the case of
//RELOAD-DISKwithSAVE-ENTITY=*DISK-SETduring job creationFDDRL.D.<vsn_6..6> in the case of
//RELOAD-DISKwithSAVE-ENTITY=*SINGLE-DISK(of a pubset save)
MAREN test mode
In order to support the MAREN test mode for FDDRL, the job name of the FDDRL main task must have the name “MARENTST”. This job name is then passed on to the subtasks.