2. Vary offline all logical drives in this cluster. The IBM SSR places this cluster in service mode (if part of a grid) and offline. All physical drives must be unloaded and emptied of cartridges. Next, from the TS3500/TS4500 MI, the drives must be unassigned from the TS7700T Logical Library. 

3. Drives now can be removed and the new drives can be installed in their places. The IBM SSR installs new drives, and checks the configuration and firmware code level by using the TS3500/TS4500 MI or another tool. If necessary, the IBM SSR updates the firmware level of the new drives. If a TS7760T is used, 16 Gb switches are necessary. 

4. New drives are assigned back to the TS7700T Logical Library by the TS3500/TS4500 MI, and the control paths are correctly assigned. Drive fiber cables are reconnected, and connections to the switches are verified. If everything appears correct, the IBM SSR runs a drive reconfiguration at the TS7700T cluster. 

5. After the reconfiguration, all new drives and paths must be available and healthy. If not, the IBM SSR acts upon the errors to correct them. This step completes the drive upgrade change. Now, the TS7700T can be taken out-of-service mode and varied online by the IBM SSR. 

Remember:  In the previous scenario, all cartridges in the filling state are closed if the new drives do not support writing in the original tape format. Otherwise, the cartridges continue to be written in the same format to the end. Scratch tapes that are in use after the change are automatically reinitialized to the new tape format. 

You can apply the same procedure when changing the tape emulation mode in the TS7700T from 3592-J1A emulation to TS1120-E05 native mode. All steps apply except the steps that relate to changing drives physically and changing drive emulation mode within the TS3500. Drive emulation is changed in the TS3500 web interface (see Figure 9-95 on page 533) by using a specific command in the TS7700T by the IBM SSR. The media format is handled as described in the previous scenario. 

## Migrating TS7700T data from sunset media type after upgrading heterogeneous drive configuration 

Consideration:  Restrictions apply to some configurations. For the valid combinations of media type and drive models within the TS7700T, see “Tape drives and media support (TS7700T)” on page 137. 

This procedure can be helpful when upgrading your tape drives to the TS1150 3592-E08 tape drives, or when replacing the media cartridges with a newer type to increase the storage capacity of your library. The E08 drives cannot read JA, JB, or JJ tapes; therefore, you must have JC, JK, JL, or JD media for the TS7700T to support new logical volumes that are written to TS1150 drives. You also must have at least two drives of a sunset generation that can read logical volumes from JA, JB, or JJ tapes. 

In this scenario, coming from a previous 3592 tape drive model to the E08, all JA, JB, or JJ media are sunset , which means that after reclaiming the active logical volumes still contained in it, the JA, JB, or JJ media can be ejected from the library. In this case, you must have a working pool of stacked volumes of the supported media, such as JC, JK, JD, or JL. Your data, formerly in a JA, JB, or JJ media, is forcibly migrated into the supported media. 

