Draft Document for Review February 7, 2020 3:15 pm 8464ch03_business requirements.fm In addition, several supporting tools to create the necessary input control statements, and the  necessary TCDB entry changes and TMC entry changes, are provided at the IBM Tape Tool  website: ftp://public.dhe.ibm.com/storage/tapetool For more information, see Chapter 8, “Migration” on page 297, or ask your local IBM SSR.  Before Release 3.3, all tape drives that were attached to a TS7700 had to be homogeneous.  There was no intermixing allowed.  With Release 3.3, you now can mix the TS1150 with  only one  older drive technology. This  intermix is for migration purposes because a TS1150 cannot read content from JA and JB  cartridges.  The following considerations apply:  3.6.3 Tape drive technology behind a TS7700  GLYPH<SM590000> The “old” technology is used only for reads. You cannot write data on the legacy cartridge  tape media by using the older drive technology.  GLYPH<SM590000> The maximum of 16 back-end drives must be divided by two tape technologies. Plan  ahead to have enough tape drives in the older technology for recalls, and maybe for  reclaim. But, have enough TS1150 tape drives to allow premigration, recalls, and reclaim  for newly written data. GLYPH<SM590000> Use the  LI REQ  to define the values for the alerts for missing physical drives for both  technologies and the TS1150. GLYPH<SM590000> Run  VEHSTATS  to understand the physical drive behavior. With reclamation, the data from the discontinued media is moved to the new data. If you do  not want that situation to occur, modify the “Sunset Media Reclaim Threshold Percentage  (%)” for the specific physical pool on the MI to 0, and 0 reclaim runs for the discontinued  media inside that pool.  130  IBM TS7700 Release 5.0 Guide