Hmm... do a lot of shops use actual cart based tapes ... TS77xx with TS4x00? Don't know if EMC DLm has a cart back-end option.
If it's VTL with disk back-end, is that any different from having it all on DASD? - KB ‐‐‐‐‐‐‐ Original Message ‐‐‐‐‐‐‐ On Monday, July 6, 2020 4:25 PM, R.S. <r.skoru...@bremultibank.com.pl> wrote: > 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. 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