> On Jan 11, 2018, at 6:44 AM, R.S. <r.skoru...@bremultibank.com.pl> wrote: > > Ed: > I am sure I had read that. Of course such promise can be broken in the future > (why not?), but whole idea of so called mod-27, mod-54 and finally EAV was to > extend volume size with no change to geometry. > > (speculation mode) > IMHO the most likely change in the future we can expect is CKD - > FBA > migration. Unless FBA storage world will change current FBA model to > something, let's say "more flash lilely". For example FBA world changed > (actually came back *) the sector size which was 512B net for ages and now > it's commonly extended to 4096kB. That introduces some incompatibility > problems. > (*) bigger sector sizes were used in magneto-optical removable media drives. > With big pain for some Unix systems and not only. > > -- > Radoslaw Skorupka > Lodz, Poland
Radoslaw: I was a project manager at Guide in the 90’s for storage. I vaguely remember being invited to San Jose (as part of SHARE+side story at bottom). IBM supposedly laid out their 10 year plan for DASD. Here is where it gets a little fuzzy. I believe the “future” was to be SMS PERIOD. IBM during one of the small sessions said that by being completely SMS you would no longer care about device geometry as long as you used the IBM SDB and the appropriate space allocations. I was a "not in my lifetime person after the session". I talked with the other project managers and they had reservations as well but after years and years of changing track size and block size issues and getting gray hair along the line I think we were happy to finally rid ourselves of one more PITA. At the time (IIRC) not all of the new SMS features were available. We were told to hold on it was being worked on. To complete the story, I am a semi believer never made it to 100 percent believer. Now the side story: One (or two?) project managers were employed by OEM vendors. IBM put a restriction of attendance that if you were a OEM vendor you couldn’t attend. Its been so long that I do not remember if IBM backed down or the people were disinvited or what. Ed ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to lists...@listserv.ua.edu with the message: INFO IBM-MAIN
