GLYPH<SM590000> High-Performance Flash Enclosure The HPFE Gen2 is an enclosure that can support both High-Performance flash drives with  capacities between 400 GB and 3.2 TB, and High-Capacity flash drives of 3.84 TB,  7.68 TB, or 15.36 TB (2.5-inch form factor), in a 2U rack space. The enclosures need to be  installed in pairs.  You can install up to 16 HPFE Gen2 pairs in the DS8888F all-flash system, up to 8 HPFE  pairs for each DS8886 in a hybrid system, and up to 4 HPFE Gen2 pairs in a DS8884  hybrid system. The DS8882 comes with one HPFE Gen2 pair (with up to 48 flash drives). For details, see the IBM Redbooks publication,  IBM DS8880 High-Performance Flash  Enclosure Gen2 , REDP-5422. GLYPH<SM590000> Standard drive enclosures The DS8880 configurations provide standard drive enclosure support for 24 small form  factor (SFF) 2.5-inch (64 mm) drives in 2U of rack space. This option helps improve the  storage density for disk drive modules (DDMs) as compared to previous enclosures. The DS8886 configuration can support 1,536 drives, plus 384 flash drives, in a small,  high-density footprint (base frame and up to four expansion frames) that helps to preserve  valuable data center floor space with the 19-inch rack 40U extended to 46U. The DS8884 configuration can support 768 drives, plus 192 flash drives in a small  high-density footprint (base frame and up to two expansion frames) that helps to preserve  valuable data center floor space with the 19-inch rack 40U. As an alternative, the DS8886 and the DS8884 also support large form factor (LFF) drive  enclosures with twelve 3.5-inch (89 mm) disk drives in 2U of rack space. LFF drive  maximums are half of the maximums of the SFF enclosures. SFF and LFF enclosures can  be intermixed within the same frame and within a DA pair, although they cannot be  intermixed within a drive enclosure pair. 1.3 DS8880 architecture and functions overview The DS8880 offers continuity with the fundamental architecture of its predecessors, the  DS8800 and DS8870 models. This architecture ensures that the DS8880 can use a stable  and well-proven operating environment that offers optimal availability. The hardware is  optimized to provide higher performance, connectivity, and reliability.  1.3.1 Overall architecture and components For more information about the available configurations for the DS8880, see Chapter 2, “IBM  DS8880 hardware components and architecture” on page 25.  Note:  Some technical aspects differ between the architectures of the models DS8884,  DS8886, and DS8888, and the DS8882 rack-mounted model. For a full overview of the  architectural aspects of the DS8882 model, see  Introducing the IBM DS8882F Rack  Mounted Storage System , REDP-5505. 12  IBM DS8880 Architecture and Implementation