I forgot something obvious for me: NEVER USE TAPES FOR APPLICATION DATA.
No jobs should write or read tapes.
Nothing except backup and restore and (optionally) ML2. Managed by HSM
or FDR. Some excepions for archive copies are worth to consider.
Note: you may have 15 years old backup on new shining tape. Migration
from older tape is no nightmare at all. It is simple.
--
Radoslaw Skorupka
Lodz, Poland
W dniu 06.07.2020 o 12:49, R.S. pisze:
W dniu 05.07.2020 o 14:12, kekronbekron pisze:
Hello List,
Just wondering ... assuming there's a primary storage product out
there that can store how-many-ever hoo-haa-bytes, and is a good
product in general, it should make sense to begin eliminating all
tape (3490/3590) use right?
First, ML1 & ML2 in HSM, then HSM itself, then rebuild jobs to write
to disk, or do SMS/ACS updates to make it all disk reads/writes.
Looking at the current storage solutions out there, this is possible,
right?
What would be the drawbacks (assume that primary storage is super
cost-efficient, so there's no need to archive anything).
Few remarks:
Even the cheapest possible DASD will not replace backup and other
things (archive copy, etc.)
I did replace 3490E tapes with really cheap second hand DASD boxes, it
was approx. 20 years ago. Been There, done that. It wasn't very fine
solution, it was cheap and working. AFAIR HSM does not like DASD as
the output for some activities, can't remember details.
Someone wrote about tapes moved to DR shelter. That's very
old-fashioned. I would strongly prefer to have remote copy, that means
two dasd-boxes and connectivity between.
There are products for tape emulation on CKD disk. It is definitely no
cheap. It also consume MSU.
Tapes, even virtual tapes are OFFLINE media from MVS point of view.
Offline media are good for some oooops! mistakes.
Last, but not least: you assumption is far from reality. DASD is still
more expensive than tape. The more capacity the difference is bigger.
Tape (real one) is cheap when talking about carts and very well
scalable. However tape realm with "first cart" is extremely expensive,
because drives are expensive, controllers are expensive and ATLs are
expensive.
The real decision depends strongly on your capacity, your predicted
growths, your needs and budget.
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