Keep in mind that you are dealing with virtual DASD. There never was a 3390 model 27 or 54, so DASD providers are free to use whatever sizes tey want. Using 3 times a model 9 capacity and 6 times a model 9 capacity is conventional, but there's noting wrong with using a slightly larger size. There is no architectural limit on a 3390-27, but if you're going to use a size larger than 32760 then it must be an EAV.
-- Shmuel (Seymour J.) Metz http://mason.gmu.edu/~smetz3 ________________________________________ From: IBM Mainframe Discussion List [[email protected]] on behalf of Tony Thigpen [[email protected]] Sent: Thursday, July 2, 2020 5:51 PM To: [email protected] Subject: What is the real size of a 3390-27 and 3390-54 I am seeing some DS8000s where a mod-27 is defined as 30051 cylinders. I am seeing other sites were the mod-27 is defined with 32760 cylinders. I know the architectural limit of a mod-27 is 32760 cylinders, but if you work with multiples of mod-1 units, the 30051 number make sense. I also know that when you use the DSCLI, you can specify any number of cylinders. What I don't know is what the old GUI did. So, some questions: 1) What size is a mod-27 in your shop? 2) Was your DASD allocated using the DSCLI or the GUI? -- Tony Thigpen ---------------------------------------------------------------------- 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
