BLP Processing

When trying to access data sets on an SL tape using BLP (Bypass Label Processing), Control-M/Tape translates the file sequence numbers to their SL equivalents. This way, input dsname verification is performed against the correct data set in the Media Database. This also applies when a data set is created (or dynamically defined when input) on an SL tape. In this case, the original file sequence numbers are used. If the original file sequence numbers do not translate to the beginning of a data set, Control-M/Tape bypasses processing for the current data set (meaning, it is not recorded in the Control-M/Tape Media Database).

A different BLP processing method can be selected by installation parameter BLPDEF. For more information, see the INCONTROL for z/OS Installation Guide.

Note: Control-M/Tape is unable to determine if a scratch volume that was never used is SL. Such volumes are treated as if they are NL.