The default parameters for an existing Librarian Master File can be changed by using the -OPT REINIT option.
Acceptable parameters are COMPRESS=, NORESEQ OR RESQ, NOSEP or SEP, VAR or NOVAR, EXEC or NOEXEC, LIST or NOLIST, PR or NOPR, PUNCH, YESGO or NOGPO, YESSEQUPD or NOSEQUPD, YESBYPP or NOBYPP and ARCHIVE LEVEL.
Release: 4.4
This example changes the archive level of the Master file to 10:
//***************************************************************
//* THIS SAMPLE JCL WILL USE AFOLIBR TO CHANGE THE *
//* INITIALIZATION SETTINGS OF A MASTER FILE. *
//* ALL OPTIONS REMAINED INTACT UNLESS ALTERED BY THIS JOB. *
//***************************************************************
//STEP1 EXEC PGM=AFOLIBR,PARM='NRJS,NJTA'
//OSJOB DD DUMMY
//SYSPRINT DD SYSOUT=*
//LIST DD SYSOUT=*
//INDEX DD SYSOUT=*
//MASTER DD DSN=YOUR.LIBRARIAN.MASTERFILE,DISP=OLD
//SYSIN DD *
-OPT REINIT,ARC=10
/*
//
Refer to Librarian TechDocs: System Services / Disk Master Files / Changing Master File Defaults