On 1/9/2018 4:49 AM, Mazer Ken G wrote:
While configuring CKD storage on a new IBM DS8880 I discovered that 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.
These new calculations are now divisible evenly by 1113, a 3390 Mod-1
Changed?! No. "Mod-x" capacities have always been multiples of Mod-1
since day #1.
Mod-3 is 3X. Mod-9 is 9X. Mod-27 is 27X and so forth. Our largest
volumes are Mod-216s. They are 216X.
--
Phoenix Software International
Edward E. Jaffe
831 Parkview Drive North
El Segundo, CA 90245
http://www.phoenixsoftware.com/
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