6.1 Hardware planning for the 3959-SM1, 3958-AP1, 3958-DD4, and 3958-DE2 In this chapter, we describe which options and features can be configured with the following storage systems: IBM System Storage TS7610 ProtecTIER Deduplication Appliance Express (3959-SM1) IBM System Storage TS7650 ProtecTIER Deduplication Appliance (3958-AP1) IBM System Storage TS7650G ProtecTIER Deduplication Gateway (3958-DD4) IBM System Storage TS7680 ProtecTIER Deduplication Gateway for System z (3958-DE2) This section discusses the following topics: Specifications Hardware and software components Configuration options 6.1.1 Specifications of the IBM System Storage TS7600 series The functionality of the 3959-SM1, 3958-AP1, 3958-DD4 and the 3958-DE2 are identical, but there are differences in performance and maximum capacity. TS7610 ProtecTIER Deduplication Appliance Express (3959-SM1) The IBM System Storage TS7610 ProtecTIER Deduplication Appliance Express (3959-SM1) is a 2 rack unit (2U) bundled appliance that comes together with the disk storage and the ProtecTIER software in a 2U device. With the rail kit it is 3U. Two levels of disk capacity can