----------------------<snip>---------------------
Can I ask one quick silly questions?
I noticed that both format 1 and format 3 DSCBs use 'lower limit' and 'upper
limit' to describe the scope of each extent and they're all in CCHH format,
not CCHHR as I assumed.
Does that mean all data sets in z/os will consist of complete tracks? So a
track is the smallest unit we can allocate to a data set. We cannot, say,
allocate a half of a track to one data set and the left to another one. (I
know we can allocate space in other units such as BLKS, KB, RECORDS... but I
guess they'll be rounded to tracks or cylinders by system at end)
----------------------<unsnip>-------------------------
All DASD allocation is in terms of tracks or cylinders, regardless of
the JCL parameters used to specify the space requirements. Allocation in
bytes, KB or MB is converted to the appropriate number of tracks by
operating system routines that are "geometry aware". This is also why
the "R" isn't necessary in the specification of track addresses for
extents.
The "CCHH-CCHH" pairs in the various DSCB's in the VTOC specify the
first and last track of each extent, so the CCHH of the first track of
the first extent is the start of the dataset, begining with record 1 on
that track.
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