John Eells wrote:
Dennis Trojak wrote:
How many cylinders on a 3390-27? I see conflicting doc of 32760 cyls or
3*10017 which is 30051. Can anybody confirm?
Dennis
The "non-real" designations for 3390-nn are simply labels used to
simplify conceptual management of volume sizes. A number of other
intermediate volume sizes can also be defined and used.
Given that there is no such thing as a "real" 3390-27, in my opinion you
can make equally valid (or otherwise) arguments for the number of
cylinders in a 3390-27 being:
[...]
IMHO you missed very important factor: HISTORY.
Historically we had real devices, then the devices were emulated. Then
came Shark (some model) and support for volumes larger than mod9, the
limit for THESE DAYS was 32760 cylinders.
And I bet this is the answer (for ambigous question)
Then came DS8000 announcement and information about support for even
larger volumes, that mean up to 65520 cylinders.
First one was named mod-27 and second one mod-54.
What's important - you could have older HW or SW which supports mod-27,
but not mod-54! I vaguely remember some "advanced copy services"
features limited to mod-27, despite mod-54 was already available on the box.
In this context the only correct answer is "mod27 is UP TO 32760".
My €0.02
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Radoslaw Skorupka
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