On Tue, 9 Jan 2018 13:12:39 +0000, Vernooij, Kees (ITOPT1) - KLM  wrote:

>1. No problem, defaults are there to be overruled.
>2. I don't understand the new value, we use the largest non-EAV volumes on our 
>'3390-58's, with 64554 Cyls, which is 58 chunks of 3390-01's.
>3. Indeed
>> 
>> W dniu 2018-01-09 o�13:49, Mazer Ken G pisze:
>> the default number of cylinders for a 3390-27 and a 3390-54 has changed.
>> > Caution should be taken when your defining new storage.
>> >
>> > I've always assumed that a 3390-27 had 32,760 cylinders.  Not the case
>> anymore, if using the GUI and the DISK or Mod1 calculations.  You end up
>> getting 30,051 cylinders.
>> > I've also assumed that a 3390-54 had 65,520 cylinders.  Now the
>> default number of cylinders is 60,102.
>> >
That happens to be 54 Mod-1s, by my reckoning.

Is there a rationale for that value?  Some mystique about the number 54
as opposed to be 58?

A fortiori, what rationale for changing a default, which IBM is ordinarily 
loath to do?

-- gil

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