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Figure 3-5 Altix 450 IRU System Components Example
Bay (Unit) Numbering
Bays in the racks are numbered using standard units. A standard unit (SU) or unit (U) is equal to
1.75 inches (4.445 cm). Because IRUs occupy multiple standard units, IRU locations within a rack
are identified by the bottom unit (U) in which the IRU resides. For example, in a 42U rack, an IRU
positioned in U01 through U05 is identified as U01.
Rack Numbering
Each rack is numbered with a three-digit number sequentially beginning with 001. A rack contains
IRU enclosures, optional mass storage enclosures, and potentially other options. In a single
compute rack system, the rack number is always 001.
Router
board
Router
board
Power
supplies
System control
board
Compute/memory blades
Po
rt
H
Po
rt
G
P
ort
H
P
ort
G
inside
TM
L1 controller
panel
SAS 4X USB0 USB1 USB2 USB3
HDD0 HDD1
DVDROM
ETH0 ETH1
PCI-X 1 PCI-X 0
F1 F2F3F4
A1 A2 A3A4
P0 PFN0 N1
IA blade