How to verify if the Usermods / the CA Disk Open SVC Zaps have been installed correctly and are working ?
Check the Modbit before and after a CA Disk BACKUP:
1) Create or select a sequential data set and change it
2) Check if the Modbit is ON in the F1 DSCB for this data set
3) Run a CA Disk BACKUP of this data set
4) Check the Modbit again:
- it should be OFF if the Usermods / the CA Disk Open SVC Zaps have been installed correctly
- it would be ON if the Usermods / the CA Disk Open SVC Zaps have not been installed
Use a IEHLIST LISTVTOC to check the Modbit, here the sample JCL:
//STEP01 EXEC PGM=IEHLIST
//SYSPRINT DD SYSOUT=*
//FIRST DD UNIT=SYSDA,VOL=SER=vvvvvv,DISP=SHR
//SYSIN DD *
LISTVTOC VOL=3390=vvvvvv,DUMP,DSN=abc.dsn
/*
You will see that the F1 DSCB field DS1DSIND (Data set indicators) at offset +93 is "2" before the BACKUP (MODBIT is ON) and "0" if the MODBIT is OFF after the BACKUP .