I had been thinking about that while working on something else
and as soon as you said the EXCP part....
Some years ago I was working on NDM and was running all these
tape tests using NDM (function testing as a result of prepping a
new Release or Version).
A few months later, as I recall, we got a letter from IBM
announcing that EXCP would no longer be supported for SCSI type
tape drives.
As I recall, our EXCP code was still being used to read tape
labels....
EXCP code could allow one to position a tape and read it without
the system checking for labels, etc.
Since I haven't touched that code or any like it for about 10
years, I wonder if VTS code in z/OS would allow EXCP.
Meanwhile, EXCP would allow a data security exposure, wouldn't
it? Unless it requires APF...
On 2/8/2024 5:19 PM, Paul Gilmartin wrote:
[email protected]> wrote:
In the "scratch category" settings, you can set an "expire hold" field that
tells the TS77xx how long to keep an expired tape before releasing it to scratch. I believe that
once that threshold is crossed, the TS77xx rewrites the tape mark to the beginning of the tape and
all data is lost - unless IBM has some magic they can preform on the back end.
"Expired" but not really!? This makes as little sense as expecting to read a
temporary data set in a subsequent job.
With a physical tape one might EXCP, bypass errors, and recover some data.
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