50 007-5832-002
3: System Overview
Bay (Unit) Numbering
Bays in the racks are numbered using standard units. A standard unit (SU) or unit (U) is equal to
1.75 inches (4.445 cm). Because IRUs occupy multiple standard units, IRU locations within a rack
are identified by the bottom unit (U) in which the IRU resides. For example, in a 42U rack, an IRU
positioned in U01 through U10 is identified as U01.
Rack Numbering
Each rack is numbered with a three-digit number sequentially beginning with 001. A rack contains
IRU enclosures, optional mass storage enclosures, and potentially other options. In a single
compute rack system, the rack number is always 001.
Optional System Components
Availability of optional components for the SGI UV 2000 systems may vary based on new product
introductions or end-of-life components. Some options are listed in this manual, others may be
introduced after this document goes to production status. Check with your SGI sales or support
representative for current information on available product options not discussed in this manual.
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