I'm looking at the LISTC of a DB2 catalog (not an ICF, one of it's own).
The allocation is CYL 3,1. The extent info shows that the 1st extent is
390 tracks which is 26 cylinders, this is followed by a bunch of 15
track extents. Any thoughts ?
IBM made a change some time ago, such that if a new extent is contiguous
with the last existing extent of a cluster, it just made the new extent
part of the existing extent.
So, your cluster was probably allocated with 3 cyls, then was extended
23 times, each time being a cylinder right behind the last. Then it
started getting cylinder extentions that were NOT contiguous.
--
Bruce Black
Senior Software Developer
Innovation Data Processing
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