----------------------------------<snip>--------------------------------------
AFAIK, you are limited to 16 extents on a volume (NON-VSAM, PDS, DAM,
etc.). If you are allowed (or can) do multi-volume, then yes, you get 16
[max] per volume for 59 volumes.
Reclaiming space in the VTOC: If I can get all my space consolidated to
just the DSCB #1, then all the other DSCBs (model 3s) become available,
giving space for more allocations in the VTOC. If I remember correctly,
there can be up to 4 Model 3 DSCBs to get you to 16 extents (for a data
set) -- (non-VSAM, PDS, DAM, PS, etc.). Otherwise, once you have used up
all the DSCBs in the VTOC, you can't allocate anything more, or even get
a secondary extent on that volume. So defragging does recover space for
a VTOC.
--------------------------------<unsnip>--------------------------------------
I can't speak for Extended Format, but for non-Extended Format datasets,
you can only have one FORMAT-3 DSCB per dataset (Except for the special
case of ISAM, now long dead.)
Rick
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