As well as individual private or public disks, FDDRL can also save complete pubsets. The advantage of saving pubsets as opposed to saving individual disks is that FDDRL independently determines all disks of the pubset, thus guaranteeing a complete and consistent backup. The statements COPY-PUBSET and DUMP-PUBSET are available for saving pubsets.
FDDRL supports the saving of complete SF and SM pubsets. You do not need to distinguish between these two pubset types, as FDDRL determines the type itself by evaluating the MRS catalog:
A conventional SF pubset can be recorded in the master catalog but need not be.
An SM pubset must be entered in the master catalog with the name and device type of the control volume set. The entry must be up to date and complete. If an SM pubset is not entered in the master catalog, FDDRL assumes when analyzing the statement that it is dealing with an SF pubset. If this is not the case, the error will not be detected until the FDDRL job is generated (CREATE-JOBS statement).
To determine all volume sets of an SM pubset, a so-called mini import is performed on the control volume set. Volume sets with the status “defined only” or “defect” are not included in the save.
FDDRL checks the time stamps of all disks of a volume set to make sure that they belong to that set (consistency check). This involves the requesting of all disks of the volume set before processing and the reading of their BS2000 standard labels.
FDDRL can only process a pubset if it has exclusive access to it. All disks on the pubset must be attached. The pubset may not be imported. An imported pubset can be saved when consistent copies of all disks exist (created by Saving Clones (SHC-OSD) or Mirroring with DRV.
Saving the home pubset
Disk mirroring with DRV or SHC-OSD allows you to split the mirrored disks of the home pubset during live operation. FDDRL can save the mirror disks which have been split in this way in the same manner as the pubset’s original disks. These means that the home pubset is saved during BS2000 operation.
An online save can be started with FDDRL for the unmirrored home pubset during ongoing operation. The prerequisites and how the save is performed are described in the chapter "Saving the home pubset online".
If an online save with FDDRL is not possible, the home pubset can only be saved offline. In this case the active system must be terminated in order to perform the save. The disks can then be attached to another system or standby system and saved using FDDRL.
Adjusting the size of volumes using SPACEOPT
When a volume is copied and restored with FDDRL, the capacity of the saved volume is always taken over, even when the output disk had a higher capacity beforehand.
Following restoration, a mixture created in this way can be removed by adjusting the size with the SPACEOPT command ADAPT-PUBSET-SIZE. This function is only available for disks of a pubset.
A pubset which was enlarged by adjusting the size with /ADAPT-PUBSET-SIZE should be imported and exported again before being saved so that it is backed up on the basis of a consistent F5 label and the save scope to the allocated PAM pages is thus reduced.