SAE's Restore Services provide a comprehensive collection of tools that allow a stand alone restore of a dataset. This is a departure from other stand alone restore products which provide for the stand alone restore of a full volume (or selected absolute tracks). In many recovery situations, the restore of a complete DASD volume is not required and may also regress other changes which would further complicate the recovery process. SAE's ability to restore a single dataset combined with its ability to allocate and copy datasets provides a much more flexible restore capability. Also SAE's support of restore from DFSMSdss (DF/DSS) or FDR volume dumps means that SAE's restore capabilities can be used without having to change or add to your existing backup processes.
Restore Services provide for a stand alone dataset restore from three backup
sources.
DFSMSdss (DF/DSS)
SAE is now capable of restoring a dataset from a DFSMSdss (DF/DSS) FULL or DATASET dump. This means that you can now use your existing DSS dump tapes to perform a stand alone restore of just the datasets you need without having to restore an entire
volume.
FDR/DSF
SAE is now capable of restoring a dataset from a FDR FULL or a DSF dataset dump. This means that you can now use your existing FDR/DSF dump tapes to perform a stand alone restore of just the datasets you need without having to restore an entire volume.
Note: SAE does not use FDR or DFSMSdss in processing tapes created by those product. The file format of FDR and DFSMSdss tapes vary and may change from release to release. SAE may not support all current FDR or DFSMSdss formats nor the formats of future FDR or DFSMSdss releases.
IEBCOPY/IEBGENER
The IEB Restore function is used to restore a partitioned dataset or selected members of a partitioned dataset from a tape containing an IEBCOPY unloaded partitioned dataset or to restore a sequential dataset from a IEBGENER unloaded sequential dataset. The restore may be made to an unlike device type (i.e. 3380 backup restored to 3390). The target dataset for the restore must already exist. SAE's dataset allocation function can be used to allocate the target dataset if it does not already exist. If the target dataset is smaller than the dataset being restored, SAE will allocate additional extents to accommodate the restore.
In order to restore a dataset from tape, the tape volser and the file sequence number of the backup dataset must be
known (see Tape Scan). Only these two pieces of information are required to perform the restore.
The SAE Integrated Backup Control System
To aid in taking the backups and determining the required restore information (volser, file sequence number), the SAE Backup Control System is shipped as part of the Applications set. Besides taking the backups of selected datasets, the system maintains a master file that describes the dataset that was backed up, the tape volser on which the backup resides and the file sequence number of the backup dataset on that tape. The Backup Master file is maintained on DASD and two copies can be maintained on tape. If tape copies of the Backup Master file are maintained, the copies are always written to the same two tape volsers which are defined to SAE during installation. If a restore is required and the DASD copy of the Backup Master File is unavailable, SAE can request the mount of one of the Backup Master file tapes. From the Backup Master file tape, the correct location (volser and file sequence number) of the required backup can be determined.
