During a study for program who doesn't conform on good practice guide, IBM said that some programs doesn't execute instructions on the good sequence,
IBM doesn't give us the name of the program, but at this time frame there is only archiving CA-DISK jobs.
To investigate,do a Strobe analysis on Ca Disk archiving/backup jobs.
It seems that ADSDB001 ( at offset 2c0 length 64) , KWIKSHR4 ( at offset 100 length 64), ADSMI0002 (at offset 80 length 64), ADSUT042 ( at offset 280 length 64) and GSMFSCRN ( at offset 500 length 64) are programs who have the more CPU impact.
Here is the link to IBM site to understand the problem and have examples: http://www-03.ibm.com/support/techdocs/atsmastr.nsf/WebIndex/WP102806
For IBM study there is more than 5% overhead. How to get it fixed?
Release : 12.5
Component : CA Disk Backup and Restore