W dniu 2014-12-04 o 23:23, Joel Ewing pisze:
Every MVS volume I have seen in the last two decades is on an emulated
3390 drive, although no doubt somewhere people are still running real
3380s or 3390s.
I doubt it. Even if someone is really using real 3380s, it's completely
irrelevant, because we are not talking about live museum rather about
conteporary datacenters. Maybe someone's still using punched cards, but
who cares?
Re comment by R.S.:
I agree that one is extremely unlikely to lose a single MVS
volume/emulated drive in today's DASD subsystems from HW failure. but if
there is any way a single volume can be accidentally forced offline,
hung, undefined, or trashed out from under a running MVS system, I'm
sure a System Programmer somewhere will discover it. If all else
"fails", unintentionally sharing DASD and unintentionally writing to the
wrong unit address and volume from an independent system can do anything.
Well, that's close to my opinion, however I have to admit that none of
the scenarios above hapened to me in production. I'm quite happy of
that ;-)
IMHO while people make mistakes, there are methods to make it more
unlikely. And the software itself is even less prone to make such issues.
BTW: long time ago, when we were fresh and young I ordered drill titled
"what will you do if ... fail?"
We were destroying many things intentionally just to train methods for
recovery. Sometimes we found unexpected troubles, i.e. my CICS sysprog
was able to recover some VSAM dataset with definitions from backup, but
he wasn't able to delete broken VSAM. He learnt how to use the dataset
under changed name. We also learnt what (else) should we back up. ;-)
Regards
--
Radoslaw Skorupka
Lodz, Poland
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