In
<CA+Myz1Xi2WKp7H+pwHve4ZpyvtLAHoED8zzrUu=vcz6nvvt...@mail.gmail.com>,
on 08/23/2013
at 07:30 AM, Quasar Chunawala <[email protected]> said:
>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?
Data are stored on DASD and tape; the DASD need not be disks. However,
z/OS only supports DASD and tape systems that look like supported[1]
ECKD disk drives or supported tape drives at the channel level. Under
the covers they might be any appropriate conbination of, e.g., disk,
flash, tape.
>What *storage media* is used to store petabytes of data and
>information?
That's open ended. In general, the choice of technologies will be
driven by price and performance constraints. In most cases I would
expect tape for archival data and disk for most online data, with a
heavy sprinkling of solid state devices for caching and high usage
data.
>Can DASDs or tapes be virtualized?
AFAIK, every DASD still in production for use on z/OS is virtualized.
Virtual tapes are old hat, and at this point in time probably are the
majority.
Don't forget files accessed from an external file server, e.g., NFS.
[1] IBM has dropped support for older devices, so this means 3380
or 3390.
--
Shmuel (Seymour J.) Metz, SysProg and JOAT
ISO position; see <http://patriot.net/~shmuel/resume/brief.html>
We don't care. We don't have to care, we're Congress.
(S877: The Shut up and Eat Your spam act of 2003)
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