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4: Rack Information
See “System-level Specifications” in Appendix A for a more complete listing of SGI ICE XA
system operating specifications and environmental requirements.
SGI ICE XA E-Cell Rack Assemblies
SGI ICE XA system configurations require the use of enhanced “closed-loop” cooling and the
compute rack assemblies are generally referred to as an “E-Cell”. A complete E-Cell assembly
consists of two compute racks and an air-to-water heat exchanger (the cooling tower) for cooling
the compute racks, see Figure 4-3 for an example. The racks are connected together to create a
sealed unit to support closed-loop cooling. The E-Cell rack system does not exhaust heated air into
the surrounding environment; this means an E-Cell does not add to the heat load of the computer
room. Multiple E-Cells can be interconnected and configured to create very large systems. Many
E-Cell configurations also require the use of a separate cooling distribution rack unit (CDU rack)
(not shown in Figure 4-4 on page 54).
Figure 4-3
E-Cell Rack Configuration Example
The smallest E-Cell assembly consists of two compute racks with a cooling rack in between.
E-Cell systems use liquid-cooled compute/graphics/InfiniBand boards and also require the use of
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