DASD Unit Name

If the Automatic Batch Backout option is set to Y and a job step or system failure occurs, the execution controller invokes the IMS Batch Backout utility (and, if necessary, the IMS Log Recovery utility) to prepare the environment for job step restart. BCF dynamically allocates the log data set that was originally allocated in the job step JCL as input to these utilities. If the log data set is not cataloged, the specific device unit name is not available when BCF dynamically allocates the data set as input to the IMS Batch Backout utility or IMS Log Recovery utility.

This option provides the specific device unit name to use when the log data set is not cataloged and it resides on a DASD device.

BCF uses this option only when the log data set was originally allocated through a job step JCL statement. If BCF dynamically allocated the log data set through the Exchange Log Device Type option, it uses the same unit name to allocate the log for batch backout or log recovery as it used in the original dynamic allocation.

If DBRC is active for the job step, the value of the DASD Unit Name option should be consistent with the DASDUNIT parameter on the INIT.RECON control statement.