Running z/OS V1R8. I've found that when I use CONSOLIDATE on my DEFRAGs,
the DEFRAG doesn't work. I had a run this morning where CONSOLIDATE
actually increased the frag index, and then a subsequent DEFRAG without
CONSOLIDATE dropped it considerably. Here are the stats with CONSOLIDATE:
ADR208I (003)-EANAL(01), 2007.220 09:39:28 BEGINNING STATISTICS ON TOMM0B:
FREE CYLINDERS 000788
FREE TRACKS 005800
FREE EXTENTS 001258
LARGEST FREE EXTENT (CYL,TRK) 000036,0000
FRAGMENTATION INDEX 0.688
PERCENT FREE SPACE 11
ADR213I (003)-EANAL(01), 2007.220 09:41:42 ENDING STATISTICS ON TOMM0B:
DATA SET EXTENTS RELOCATED 000503
EXTENTS CONSOLIDATED 000504
TRACKS RELOCATED 003856
FREE CYLINDERS 000764
FREE TRACKS 006160
FREE EXTENTS 001405
LARGEST FREE EXTENT (CYL,TRK) 000036,0000
FRAGMENTATION INDEX 0.702
Here's what it looks like without CONSOLIDATE:
ADR208I (003)-EANAL(01), 2007.220 09:48:46 BEGINNING STATISTICS ON TOMM0B:
FREE CYLINDERS 000764
FREE TRACKS 006155
FREE EXTENTS 001404
LARGEST FREE EXTENT (CYL,TRK) 000036,0000
FRAGMENTATION INDEX 0.702
PERCENT FREE SPACE 11
ADR213I (003)-EANAL(01), 2007.220 09:52:56 ENDING STATISTICS ON TOMM0B:
DATA SET EXTENTS RELOCATED 002181
TRACKS RELOCATED 017080
FREE CYLINDERS 001147
FREE TRACKS 000410
FREE EXTENTS 000061
LARGEST FREE EXTENT (CYL,TRK) 001104,0000
FRAGMENTATION INDEX 0.054
Any ideas on why this happens? Does CONSOLIDATE not DEFRAG by design?
Regards,
Tom Conley
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