I'm not a DASD guy and have never been involved in setting up or initializing an array box, but I can see that our Mod9 sysres volumes have a capacity of 10,016 cylinders. That is one cylinder shy of 9x a mythical Mod1 as described. It's not 9x any integer at all.
The most important thing for any shop is to make new ModX volumes the same size as old ModX volumes in order to TDMF or otherwise copy volumes from old to new. . . J.O.Skip Robinson Southern California Edison Company Electric Dragon Team Paddler SHARE MVS Program Co-Manager 323-715-0595 Mobile 626-543-6132 Office ⇐=== NEW [email protected] -----Original Message----- From: IBM Mainframe Discussion List [mailto:[email protected]] On Behalf Of Ed Jaffe Sent: Tuesday, January 09, 2018 9:41 AM To: [email protected] Subject: (External):Re: Number of Cylinders per Volume 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/ ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to [email protected] with the message: INFO IBM-MAIN
