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Individual Rack Unit

From Higher Intellect Vintage Wiki

The Individual Rack Unit or IRU was introduced with the Altix 4000 family, but continues to appear in subsequent SGI products.

As originally introduced it essentially allows a blade center approach to housing system components, using the NUMAlink interconnect between them. The IRU is 5U for the Altix 450 and 10U for the Altix 4700 and supports 5 or 10 blades, of which 1 or 2 are double-width slots, respectively. For more information about configuring IRUs, see the Altix 450 or Altix 4700 product pages.

Altix 450 IRU Altix 4700 IRU