IBM's SU60 formally defined and introduced support for a change bit DS1IND02 in the format-1 DSCB for each non-VSAM data set. The CA Disk SVC recognizes and supports this same change bit. Both the CA Disk SVC and SU60 intercept processing for a data set that is being opened for output and turn on the change bit. The CA Disk incremental backup function identifies the modified data sets by this bit in each VTOC entry. As each changed data set is identified, CA Disk creates and indexes a backup copy, and then optionally turns the change bit off.
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