Abstract: Methods for recovering data sets using existing catalog entries are described. The data sets to be recovered may correspond with a portion of a data storage volume that has been archived. In some embodiments, an archived data set may be re-cataloged to a pseudo-volume in order to preserve catalog sequencing information for data sets that are members of the data set. In some embodiments, a data storage system may utilize a system interrupt to detect that a request to create a new data set has failed due to a conflict with an existing catalog entry, acquire data set creation parameters associated with the request to create the new data set, and issue a catalog alter command using the data set creation parameters in response to detecting that the request to create the new data set has failed.

Abstract: Methods for automating the processing of generation data groups as groups prior to data recovery are described. The generation data groups to be recovered may correspond with a data storage volume that has been taken offline or has suffered a hardware failure. Prior to data recovery, a table of data sets associated with the data to be recovered may be created and then sorted based on the base names, creation dates and generation numbers of the data sets. The sorted table may be used to identify a particular sequence of generation data sets associated with a particular generation data group to be recovered. The generation data sets corresponding with the particular generation data group to be restored may be selected based on a catalog status of the particular generation data group and whether the particular generation data group is in a rolled-off or wrapped state.

Abstract: Methods for automating the processing of generation data groups as groups prior to data recovery are described. The generation data groups to be recovered may correspond with a data storage volume that has been taken offline or has suffered a hardware failure. Prior to data recovery, a table of data sets associated with the data to be recovered may be created and then sorted based on the base names, creation dates and generation numbers of the data sets. The sorted table may be used to identify a particular sequence of generation data sets associated with a particular generation data group to be recovered. The generation data sets corresponding with the particular generation data group to be restored may be selected based on a catalog status of the particular generation data group and whether the particular generation data group is in a rolled-off or wrapped state.