MSGLEVEL=(1,1) is the default for the JOB statement. The first parameter (1) prints JCL statements to the job log, and the second (1) prints allocation messages. MSGLEVEL=(0,1) suppresses JCL printing, and MSGLEVEL=(1,0) suppresses allocation messages. MSGLEVEL=(2,1) is invalid as the first parameter only accepts 0 or 1.