Recovery from abends

The CTTSBD utility can perform recovery operations

• upon encountering a recoverable error during a run of the utility
• upon initialization of the utility following a run of the utility that was terminated due to a nonrecoverable error or a system crash

Recovery is performed as follows:

• If an input data set was uncataloged and failure occurred before the corresponding output data set was cataloged, the CTTSBD utility attempts to recatalog the input data set during the recovery process.

  Note: The CTTSBD utility attempts to recatalog a data set only once. If the recatalog attempt fails, the data set has to be recataloged manually.

• In all other cases, input and output data sets remain in the state they were in at time of failure (meaning, the abend or system crash).

This recovery logic ensures that at least one copy of each data set is always retained and, if necessary, cataloged. It may be necessary to scratch a single unneeded output data set created by an incomplete run of the CTTSBD utility.

During recovery, the CTTSBD utility must process no more than one data set - the data set that was being processed at time of abend. Data sets processed prior to the abend require no further processing.

Note: If the CTTSBD utility abended due to a physical or logical error in the Media database, use standard Control-M/Tape methods to perform recovery. For more information, see the section that discusses repository backup and recovery in the Control-M/Tape chapter of the INCONTROL for z/OS Administrator Guide.