You have 80 terabytes? One reason is IBM's refusal to accept and implement the SHARE requirement to support FBA in MVS for both access methods and IPL. However, IBM did add new DD parameters to allow the OS to do some of the calculations for the user.. Even with that, however, there would still have been issues of guarantied space and locality of reference.
I'd also ask why IBM didn't provide ACB/RPL support for all access methods, with compatibility and reverse compatibility interfaces as necessary, such as were present in OS/VS1 and VSE. It's a shame that IBM dropped TSS; moving it to FBA would have been a piece of cake. -- Shmuel (Seymour J.) Metz http://mason.gmu.edu/~smetz3 ________________________________________ From: IBM Mainframe Discussion List [IBM-MAIN@LISTSERV.UA.EDU] on behalf of Leonard D Woren [ibm-main...@ldworen.net] Sent: Wednesday, November 23, 2022 8:19 PM To: IBM-MAIN@LISTSERV.UA.EDU Subject: Re: Bytes in a 3390 track True. Yet... why is space still such a big deal on mainframes? I have almost as much disk space connected to my primary PC as 10,000 3390-9 would hold. Seeing a 3390 with 150,000 free cylinders does take some getting used to. It's time to use this brainpower for better things than optimizing the arrangement of angels on a pinhead. Just throw more hardware at it and move on. A 4 TB disk is the equivalent of almost 5,000,000 3390 cylinders, or 500 3390-9s. How much DASD can you add in the disk array for the price (salary) of one additional storage management person? /Leonard Seymour J Metz wrote on 11/23/2022 3:20 PM: > With essentially all z DASD being cached these days, a lot of the efficiency > issues no longer apply, leaving space as more dominant. > > > -- > Shmuel (Seymour J.) Metz > http://mason.gmu.edu/~smetz3 > ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to lists...@listserv.ua.edu with the message: INFO IBM-MAIN ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to lists...@listserv.ua.edu with the message: INFO IBM-MAIN
