And an add-on question if I may - zEDC or z15+ on-chip compression... does this apply only to data heading to disk, or does it apply for data heading to tape too. If it applies for data heading to tape also, does that mean there are 2 levels of compression now - CP's on-chip compression + zstd on the TS7700?
- KB ------- Original Message ------- On Sunday, April 16th, 2023 at 7:17 AM, John Young <[email protected]> wrote: > Although my post today is probably rhetorical question, I wanted to find out > whether this matters anymore or not. > > Back in the late 2000's, IBM developed encryption facilities within the tape > drives, as this is also where compression was being performed. The idea was > that compression of data must occur before encryption, as encrypted data does > not compress well, and obviates the use of compression. > > Nowadays, we've got pervasive encryption on z/OS. As a result, any data that > is backed up (for instance, ADRDSSU/FDR), is already encrypted. > > Also, we now have zEDC, to compress data prior to storage, typically on disk. > > To my question: With all the encryption and compression being performed on > disk, to what degree does TAPE COMPRESSION matter anymore? > > ---------------------------------------------------------------------- > For IBM-MAIN subscribe / signoff / archive access instructions, > send email to [email protected] with the message: INFO IBM-MAIN ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to [email protected] with the message: INFO IBM-MAIN
