Several system parameters in SYS1.PARMLIB member IEASYSxx are of special importance to BDT:

• To identify the system being initialized you must specify the SYSNAME parameter. The name you specify on SYSNAME you will later specify on the FORMAT control statement used to format message data sets (described on Step 1. Format the TQI Checkpoint, Bit-Map, and Message Data Sets).
• If BDT is to participate in a global resource serialization (GRS) complex you must specify the GRS parameter.