Some physical devices only allocate volumes in multiples of Mod 1s, or gather scattered Mod 1 segments into a full volume. 32K cylinders is 29.4 times a Mod 1 of 1113 cylinders. Not much different, but need to make sure DR site or replacement dasd unit uses same size or larger for restores or replication. Similar applies to Mod 54 is 58.8. And once into EAV territory each increment MUST be a MOD 1 multiple.
On Thu, Jul 2, 2020 at 9:52 PM Tony Thigpen <[email protected]> wrote: > > 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 -- Mike A Schwab, Springfield IL USA Where do Forest Rangers go to get away from it all? ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to [email protected] with the message: INFO IBM-MAIN
