IBM mainframes use ECKD formatted tracks. Since the manufacture of actual 3390s ended, DASD storage has been emulated on FBA (PC / Unix disk), usually in a RAID 5 configuration. Occasionally, you might run across a 3380 volume as these are also supported. Yes, Virtual tapes are stored on disk, sometimes backed by high density tape.
On Thu, Aug 22, 2013 at 9:00 PM, Quasar Chunawala <[email protected]> wrote: > Hi experts, > > I work as an application programmer with a leading bank on CICS/Cobol for > the past 4 years. Whilst I know, that data on the mainframe is stored on > disks and tapes, I have never walked in to a data-center. At any mainframe > data-center, what are different storage media used? Do they still use Tapes > or 3390 DASD? I did do some research on the Internet, but found that the > last 3390 was manufactured by IBM in 1993. What *storage media* is used to > store petabytes of data and information? I also heard the term *DASD Arrays, > * but I am not quite sure what they are. > > I have yet another question. Can DASDs or tapes be virtualized? > > Thanks a tonne in advance! > > Quasar C. > > ---------------------------------------------------------------------- > 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
