Optional Octal Router Chassis Information; Overview - Silicon Graphics UV 3000 User Manual

5.

Overview

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Chapter 5

Optional Octal Router Chassis Information

This chapter describes the optional NUMAlink router technology available in SGI UV 3000
systems consisting of two or more racks. This router technology is available in an enclosure
"package" known as the Octal Router Chassis (ORC). This optional ORC chassis can be mounted
on the top of the SGI UV 3000 rack. NUMAlink advanced router technology reduces UV 3000
system data transfer latency and increases bisection bandwidth performance. Router option
information is covered in the following sections:
• "Overview" on page 61
• "SGI UV 3000 Series NUMAlink Octal Router Chassis" on page 62
• "SGI UV 3000 External NUMAlink System Technical Specifications" on page 64
At the time this document was published, external NUMAlink router technology was available to
support from 2 to 512 SGI UV 3000 racks. Other "internal" NUMAlink router options are also
available for high-speed communication between smaller groups of SGI UV 3000 racks. For more
information on these topics, contact your SGI sales or service representative.
The standard routers used in the SGI UV 3000 systems are the NL6 router blades located internally
to each IRU. Each of these first level routers contain a single 16-port NL6 HARP router ASIC.
Twelve ports are used for internal connections (connecting blades together), the remaining four
ports are used for external connections. The NUMAlink ORC enclosure is located at the top of
each SGI UV 3000 rack equipped with the option. Each top-mounted NUMAlink ORC enclosure
contains four or eight 16-port HARP ASIC based router boards. Each of these router boards has a
single NL6 HARP router ASIC. This is the same router ASIC that is used in the NL6 router blades
installed inside the system IRUs.
Note that the ORC chassis also contains a chassis management controller (CMC) board, two
power supplies and its own cooling fans.
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