Dell DR4000 - Manual (Page 16)

16 Setting up IBM TSM on the Dell™ DR4X00 Disk Backup Appliance
Device Class Name: This is the name of the DR4X00 Device Class Created in Step 6.
Maximum Number of Scratch Volumes: This is the number of scratch volumes in the system.
Note: DR4X00 recommends setting the value between 100 to 200 scratch volumes.
13. Accept the defaults and click Next
Identify the duplicate data in the storage pool: Leave this box as unchecked as DR4X00 uses inline
deduplication and already identifies and removes duplicate data.
14. Review and Click Finish