As a thought exercise... Is it possible to make zOS, storage controllers, etc. just lie to the requesting application.
App or JCL DD: Give me space for 'x' records, with a blocksize of 'y', exactly! storage: Ok (but not really, I'll do what's best for myself!) I know it already lies/emulates to some extent (about 3390, track, cylinder, etc.).. is it not possible (and desirable) to do away with specifying things in terms of tracks & cylinders? There are products that change allocation real-time, in-line... can this be done at the storage controller level, while allowing some simplification in zOS? - KB ------- Original Message ------- On Thursday, November 24th, 2022 at 6:49 AM, Leonard D Woren <[email protected]> wrote: > 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 [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
