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Chapter 3
3.
System Overview
This chapter provides an overview of the physical and architectural aspects of your SGI Integrated
Compute Environment (ICE) XA series system. The major components of the SGI ICE XA
systems are described and illustrated.
Because the system is modular, it combines the advantages of lower entry-level cost with global
scalability in processors, memory, InfiniBand connectivity and I/O. You can install and operate
the SGI ICE XA series system in your lab or server room.
Each 42U SGI E-Cell rack holds up to four 10.5U high blade enclosures. Each blade enclosure
provides power, system control, and the network fabric for nine compute blades using a
non-blocking backplane. The ICE XA E-Cell rack assembly consists of two custom designed 42U
high racks paired with a dedicated cooling rack (between the two compute racks). The cooling
rack circulates air and removes heat from the system and passes it to water-cooled extractors that
carry away the heated air from the assembly. Each blade enclosure also has an internal InfiniBand
communication backplane. Each of the (up to) nine compute blades supported in an enclosure are
equipped with up to four two-socket nodes, with ASICs, memory components and I/O chip sets
mounted on them. The blades slide directly in and out of the enclosures. Every processor socket
on a blade supports dual-inline memory module (DIMM) memory units using DDR4 bandwidths.
Optional PCIe slots, hard disk or solid-state (SSD) drives and MIC or GPU option boards are
available.
Each compute blade supports two or four individual node boards. Note that a maximum system
size of 72 compute blades per E-Cell rack assembly (9 blades x 8 enclosures) is supported at the
time this document was published. Non-blade enclosures such as the system administration node,
rack leader controller (RLC), and optional service nodes or storage units are housed in 42U D-rack
configurations. Optional chilled water cooling may be required for large processor-count rack
systems. Contact your SGI sales or service representative for the most current information on
these topics.
Internal IB switch ASICs located in switch blades in the blade enclosure eliminate the requirement
for external IB switches when deployed with hypercube, enhanced hypercube or all-to-all
topologies. The InfiniBand technology provides for fast communication between compute blades
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