Biggest Onyx 2 rack configuration?

[Richard]

It seems that these Onyx 2 rack systems are pretty available.  If I
wanted to max out the system configuration, what's the theoretical
max?  I didn't even know they could gang 4 racks like the one I have.

As I understand it, they subdivide a rack into "bricks" and then
components (disk drives, graphics cards, etc.) plug into the brick.
I believe the bricks are identified by a single letter code.  Does
anyone know of a reference for this sort of SGI stuff?  I know SGI has
manuals online, but it helps to know the specific manual to use as a
starting point.

The racks have an integrated power supply, so maybe they identify the
amount of equipment per rack based on power consumption?
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