Since IBM does define any model larger than a Mod-9, usage of other Mod-xx terms is user defined. I would think, however, that the historical derivation of model terminology is based on capacity relative to a (mythical?) Mod-1. In any case, a Mod-9 is 3x the size of a Mod-3, so I would expect a Mod-27 to be 3x a Mod-9. Similar consideration for a Mod-54. (Have not heard discussion of anything larger.)
. . . J.O.Skip Robinson Southern California Edison Company Electric Dragon Team Paddler SHARE MVS Program Co-Manager 626-302-7535 Office 323-715-0595 Mobile jo.skip.robin...@sce.com -----Original Message----- From: IBM Mainframe Discussion List [mailto:IBM-MAIN@LISTSERV.UA.EDU] On Behalf Of Jasi Grewal Sent: Wednesday, November 18, 2015 9:00 AM To: IBM-MAIN@LISTSERV.UA.EDU Subject: (External):Is there an Standard Size for 3390-27's? Greetings, I would like to know, if there are any standard sizes for 3390-27's because I read different manuals and each of them refers as either 30015 Cyl or 32760Cyl for Mod 27's. Would like to hear your setup of Mod 27's and if you are using 30015 or 32760 Cyl for Mod 27's. Here's the two manuals that states two different settings for mod 27's: http://www.scribd.com/doc/51615339/IBM-Mainframe-Disk-Capacity-Table#scribd http://www.redbooks.ibm.com/redpapers/pdfs/redp4187.pdf Model Cylinders Tracks Bytes/volume Bytes/track 3390-1 1113 16695 946 MB 56664 3390-2 2226 33390 1.89 GB 56664 3390-3 3339 50085 2.83 GB 56664 3390-9 10017 150255 8.51 GB 56664 3390-27 32760 491400 27.84 GB 56664 3390-54 65520 982800 55.68 GB 56664 Then this manual states 30015 Cylinders: http://www-01.ibm.com/support/docview.wss?uid=tss1prs4558&aid=1 Thanks in advance, Regards, Jasi Grewal. ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to lists...@listserv.ua.edu with the message: INFO IBM-MAIN
