OPTIMIZE channel programs fail on tracks that have overflow records. An attempt was made to dump x tracks using optimize channel program chain. Of these x tracks, y tracks were dumped using a nonoptimized channel program chain because track overflow records were encountered in using optimize channel programs.
The y tracks are processed using normal channel programs. This results in performance degradation.
None.
If the number is large, the names of data sets not marked as track overflow data sets in the VTOC must be specified in the TRACKOVERFLOW keyword if OPTIMIZE(2), (3), or (4) is specified. If ALLDATA or ALLEXCP is specified for a data set, the allocated tracks beyond the end of the used data might have residual track overflow records. If so, do not code ALLDATA or ALLEXCP for these data sets.
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