Last time I looked they were all 3390-9... (GD&R). -----Original Message----- From: IBM Mainframe Discussion List [mailto:[email protected]] On Behalf Of Mazer Ken G Sent: Tuesday, January 9, 2018 4:50 AM To: [email protected] Subject: [IBM-MAIN] Number of Cylinders per Volume
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 If you have a need to define these two volumes sizes please keep this in mind as this could cause serious issues when trying to migrate from the older volume sizes to the newer sizes. I did find the new smaller sizes documented in the DS8870 & DS8880 Architecture and Implementation Redbooks. Ken Mazer ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to [email protected] with the message: INFO IBM-MAIN ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to [email protected] with the message: INFO IBM-MAIN
