On Jul 12, 2007, at 10:26 AM, Rick Fochtman wrote:
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You're right, but the downside is this: there are literally
millions of lines of JCL still in regular use that allocate space
in terms of tracks and cylinders. To change the length of a track
would invoke nightmares of geometry changes, which we all suffered
through in pre-3390 days whenever a newer DASD design hit the
street. IT managers that remember those days still cringe at the
thought! Until all allocations are done in terms of bytes, or
multiples thereof, a geometry change will put people into cold
sweats. Old habits are hard to break; old nightmares are hard to
forget.
Rick,
I thought one of the reasons why IBM came up with AVGREC and the
other new SMS allocation parameters was to get rid of the idea of
tracks and cylinders concept. I went on the band wagon years ago to
change over. I was totally unsuccessful. People (I think) are used to
doing it the old way and do not want to change.
Ed
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