I think you misinterpreted Tom's remarks.
He wasn't disputing that 3380 emulation was in use, only the logical
inconsistency of your use of the existence of 3380 emulation as an
argument supporting the ability of installations to easily handle some
new DASD architecture.
3380 emulation is most likely in use precisely because transitioning to
the 3390 DASD architecture was not trivial and involved costs the
installation wished to avoid. Add a new DASD architecture to the
picture, and those running 3380 emulation today will probably still be
wanting to run 3380 emulation on the new DASD.
If you are emulating old DASD architecture on new architecture hardware,
you haven't yet migrated applications to the new architecture - and you
run the risk that at some point the latest hardware or Operating System
may cease to support the older architecture. That installations choose
to run these risks is an indication of the difficulty of utilizing new
DASD architecture, not an indication of the ease of supporting multiple
DASD architectures.
R.S. wrote:
Tom Marchant wrote:
[...]
I disagree. Completely. Mainframe users had to do with different
track sizes, some dataceneters still have 3380 emulation.
It sounds like you are disagreeing with yourself here. Why do you
think some data centers still use 3380 emulation?
I don't see logic conflict here. As I said, many people worked in
datacenters where various geometries were in use. I also wrote there are
shops still using 3380 geometry. Why do I think so ? Because I was in
one of them about week ago. It's still on the place. I know few other
shops using 3380. I don't *think* they do it, I *know* it.
BTW: I know shop in Poland which used 3380 drives. *Real* ones,
manufactured by Comparex. It was few years ago, for sure *after* Y2000.
I haven't heard about them for few years, so I don't know their current
status.
--
Joel C. Ewing, Fort Smith, AR [EMAIL PROTECTED]
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