Figure 2-7 shows a dense expansion drawer. Figure 2-7 IBM dense expansion drawer 2.5.9 Expansion Enclosures The following types of Expansion Enclosures are available: IBM Storwize V7000 Gen2 LFF 12F includes the following components: IBM Storwize V7000 SFF Expansion Enclosure Model 24F includes the following  components: The Expansion Enclosure is a 2U enclosure that includes the following components: GLYPH<SM590000> RS232 port on the back panel (3.5 mm stereo jack), which is used for configuration during  manufacturing. GLYPH<SM590000> Two Power supplies. GLYPH<SM590000> Two fan assemblies, which mount between the drive midplane and the Node Canisters.  Each fan module is removable when the Node Canister is removed. GLYPH<SM590000> Two Storage Bridge Bay (SBB)-compliant enclosure services manager (ESM) canisters. GLYPH<SM590000> A total of 24 2.5-inch drives (HDDs or SSDs). GLYPH<SM590000> 2U, 19-inch rack mount enclosure with AC power supplies GLYPH<SM590000> A total of 24 slots for 2.5-inch SAS drives GLYPH<SM590000> 12 Gb SAS ports for control enclosure and expansion enclosure attachment GLYPH<SM590000> Two expansion canisters GLYPH<SM590000> 2U, 19-inch rack mount enclosure with AC power supplies GLYPH<SM590000> A total of 12 slots for 3.5-inch SAS drives GLYPH<SM590000> 12 Gb SAS ports for control enclosure and Expansion Enclosure attachment GLYPH<SM590000> Two expansion canisters GLYPH<SM590000> IBM Storwize V7000 small form factor (SFF) 24F GLYPH<SM590000> IBM Storwize V7000 large form factor (LFF) Expansion Enclosure Model 12F  Chapter 2. System overview  25