W dniu 2011-07-19 16:06, Vernooij, CP - SPLXM pisze:
And if anybody wonders *why* z/OS does not allow you to do a specific mount of
a SCRTCH tape:
Your SCRTCH tapes will probably have a 'Fast Ready Category' assiged in your
VTS. This means, that when you request a tape from such a category, you intend
to write new data on it and don't care about the old data on the tape.
Therefor, the VTS will not bother recalling the old data, but will immediately
assing you a new blank tape in its cache. If you then try to read, you will see
an empty tape. Furthermore, this empty tape will now be *the* current instance
of this volser, with your old data still available somewhere on the backend
cartridges, but unreachable for you. IBM VTS support seems to provide a paid
service to recover the old data in such a case.
There are more reasons, valid in real tape world also.
The tape is considered as scratch, which could mean "we don't need any
date on the tape" - but it doesn't mean "anyone can READ the tape now".
That's why RMM does not allow to read such tape, even if it's mounted as
non-volume-specific scratch mount. Volume-specific mount could mean
someone wants to overwrite THIS tape.
Usually to read (use) the scratch one must change volume status from
scratch to private (master or user in RMM terms). Obviously this is
controlled i.e. using RACF profiles.
--
Radoslaw Skorupka
Lodz, Poland
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