No Backups for empty Data Sets

Document ID : KB000115737
Last Modified Date : 25/09/2018
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Question:
We are running with SYSPARM ARCEMPTYy, but we have just archives and no backups for empty Data Sets.
What is the reason for that?
Answer:
As these Data Sets were allocated only and never opened for OUTPUT the Change Bit in the FORMAT 1 DSCB is off and thus 
they were not processed because of SMS rules:

ADSST012 9999 ----------------------------------------------------------------------
ADSST012 9999 FUNCTION = BACKUP                                                     
ADSST012 9999 SMS CONTROLLED DATA SET = EMPTY.DATA.SET             
ADSST012 9999 STORAGE GROUP = SGTEMP   MANAGEMENT CLASS = MCTEMP                    
ADSST012 9999 SMS DATA SET BYPASSED BECAUSE                                         
ADSST012 9999 DSN NOT MODIFIED - BACKUP FREQUENCY