How to verify the Open SVC Zaps work

Document ID : KB000014265
Last Modified Date : 14/02/2018
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Question:

How to verify if the Usermods / the CA Disk Open SVC Zaps have been installed correctly and are working ?

Answer:

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 .