z/OS DFSMSdss Storage Administration
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RESTORE command for DFSMSdss

z/OS DFSMSdss Storage Administration
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With the RESTORE command, you can restore data to DASD volumes from DFSMSdss-produced dump volumes. You can restore data sets, an entire volume, or ranges of tracks. You can restore to unlike devices from a logical dump tape.

The FULL keyword with the RESTORE command restores an entire DASD volume. The TRACKS keyword for the RESTORE command restores a range of tracks.

DFSMSdss offers two ways to process RESTORE commands:
  • Logical processing is data set-oriented, which means it operates against data sets independently of physical device format.
  • Physical processing can operate against data sets, volumes, and tracks, but is oriented toward moving data at the track-image level.

    The processing method is determined by what type of dump tape is used as input and by the keywords specified on the command.

Target data set allocation differs between a physical data set and logical data set restore of non-VSAM data sets. Logical data set restore allocates target data sets according to the amount of used space in the source data set, thereby freeing unused space. Physical data set restore preserves the original size of the source data set. To force unused space to be kept during logical data set restore, the ALLDATA or ALLEXCP keyword must be specified during a dump. However, the action that restore takes with respect to these keywords depends on data set characteristics and device characteristics. If you require that all of the unused space is restored, then you should be sure that the data set is restored to a like device type and not reblocked or compressed. Compress is the default for PDS data sets on restore unless you use the NOPACKING keyword.

DFSMSdss logical restore processing cannot be used to process partitioned data sets containing location-dependent information that does not reside in note lists or in the directory.

Extended-physical-sequential data sets, VSAM extended-format data sets, and SAM compressed extended function data sets cannot be restored to non-SMS-managed target volumes during a physical or logical data set restore. Data sets with DFM attributes (created by DFM/MVS) can be restored to non-SMS-managed target volumes but the DFM attributes will be lost and a warning message will be issued.

For more information about using the RESTORE command, see Managing availability with DFSMSdss.

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