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. 

## 3.6.3 Tape drive technology behind a TS7700 

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: 

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. 

