Disk controllers and expansion units 15.2.2 The TS7620 ProtecTIER Deduplication Appliance Express  15.3 ProtecTIER definitions The customer chooses the disk controller and expansion units for use with the TS7650G. A  list of compatible controllers and their expansion units is available at the following IBM Tape  Systems Resource Library website: http://www.ibm.com/systems/storage/tape/library.html  Verify the compatibility in the TS7650G ISV and the interoperability matrix document that you  find on the website. The TS7620 ProtecTIER Deduplication Appliance Express is machine type 3959 SM2. The IBM ProtecTIER Entry Edition software is loaded on the IBM TS7620 to create the  TS7620 ProtecTIER Deduplication Appliance Express solution. A separate order for  ProtecTIER Entry Edition is required. Clients can choose between the VTL configuration or  the File System Interface (FSI), which supports Common Internet File System (CIFS) or NFS  as a backup target.  The following levels of disk capacity can be ordered: Upgrading from 6 TB to 12 TB requires only a license and a software upgrade. For the higher  capacity configurations, disk expansion units also must be installed. The TS7620 hardware  consists of the left and right slide rails, support tray, cable management assembly, external  USB DVD drive, 3959 SM2 server, and any expansion units. The TS7620 ProtecTIER Deduplication Appliance Express has system console functions that  are included, and does not require a TSSC. The TS7620 is shown in Figure 15-4. The following definitions apply to ProtecTIER technologies: A process that transfers logical objects such as virtual cartridges from one ProtecTIER  repository to another. The replication function allows ProtecTIER deployment to be  distributed across sites. Each site has a single or clustered ProtecTIER environment.  Chapter 15. IBM TS7600 ProtecTIER Systems  447 Figure 15-4 TS7620 ProtecTIER Deduplication Appliance Express GLYPH<SM590000> 6 TB (base, software limited) GLYPH<SM590000> 12 TB (base, software full capacity) GLYPH<SM590000> 23 TB (base, software full capacity plus expansion 1) GLYPH<SM590000> 35 TB (base, software full capacity plus expansion 1 and 2)  GLYPH<SM590000> Replication