IBMi Backups/Sizing and DD6300

Based on sizing recommendations of our IBMi backups (BRMS) we implemented a DD6300 with 2 ES30 shelves (45T) mid-year 2017.  After almost a year’s time we are at 72% capacity and concerned that we’ll either need to expand our current DD or begin copying our historical data back to physical tape.

Basic Backup Information:

                Backup                                 Type                      Size        Retention          

Weekly Backup                       Full                         15T         2 Year

Daily                                        Incremental            9T           5 Week

Archives                                 Archives                  2T           Retention varies from 2 years-Indefinite

We have seen growth in our backups since the original sizing estimates were provided.  However, those estimates gauged less than 20T DD in the first year with an annual growth estimate of 5%.  We are instead seeing an average monthly storage increase around 5% on the DD.

 

Below is a recent snapshot of our DD size and compression rates:

- Single VTL pool 2000 LTO5 volumes 1.5TB.  900 scratch volumes currently available.

- DD replication to DR site  (Source 72% full/Target 71% full)

Is what we're seeing for de-dupe rate/compression average?  Recommendations/advice to improve in an IBMi backup environment?