While I still miss native tapes, I see your example as partially invalid.
You can have 20 years old data on ne media, including virtual tapes.
More: YOU HAVE TO KEEP YOUR VALUABLE ARCHIVE DATA ON NEW MEDIA!
Old data, but fresh media.
Reasons:
1. Old tape can be become defective. Of course second copy ...also is
gettind older and older.
2. Old tape need old drive. New tape (or other media) means new
(supported) drive.
Things are quite simple when you use HSM for managing the data. Natural
recycling process will move the data from medium to medium, especially
during imlementation of new hardware. Even without it you can track old
carts and enforce recycling.
--
Radoslaw Skorupka
Lodz, Poland
W dniu 2018-05-22 o 12:34, Tony Thigpen pisze:
Timothy,
The biggest problem is that physical tape, unlike dasd, has been the
primary method of data archive and data transport since it was
created. (And that includes paper tape.) While tape virtualization is
great for internal tapes, off-site archival now requires an expensive
duplicate of the primary VTL. And, as machine age and are replaced,
historical archival have to be converted to the new equipment.
Also, I could always point to the tape rack and tell the auditors:
"You want the data from 20 years ago? There it is."
Tony Thigpen
Timothy Sipples wrote on 05/22/2018 02:04 AM:
Radoslaw Skorupka wrote:
It is really nice sales pitch, but *technically* IBM it is no longer
possible to write directly to a tape volume from z/OS.
First of all, it's not a sales pitch. I don't do sales pitches very
well.
Second, it's also no longer possible to "write directly" to disk drives.
*All* mainframe-attached storage -- flash/SSD, disk, and now tape -- is
highly virtualized, with intelligent controllers equipped with caches.
Why is this progress a problem? And it's a very long arc of progress,
not
at all sudden. As I've carefully and accurately documented, there was
nearly 19 years of product overlap as IBM tape made the transition to
virtualized-physical.
Finally, "ask your friendly IBM representative" about IBM TS1155/TS4500
attachment to your IBM TS7700. I have no inside information on that,
but I
do pay some attention to IBM's past practices. What I see is that, for
several generations of tape drives stretching back many years, IBM has
waited some period of time before certifying z/OS use of that new tape
drive/tape media/density. I suspect that's because IBM is just being
that
extra bit careful with your most precious data (such as most of the
world's
most important financial records) and its long-term retention needs, but
ask.
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