SGI Origin 3900 Specifications download pdf (Page 33)

System Control

007-4603-001 19

System Control

The functions of SGI Origin 3900 system control are to:

• Manage power control and sequencing

• Provide environmental control and monitoring

• Initiate system resets

• Provide storage for identiﬁcation and conﬁguration information

• Provide a console/diagnostic and scan interface

SGI Origin 3900 system control comprises three levels:

• L1 controller - brick-level system controller

• L2 controller - rack-level system controller

• L3 controller - system-level controller

L1 Controller

The L1 controller is not conﬁgurable; it is an internal design feature of all bricks except

the D-brick.

L2 Controller

The L2 controller is required with all SGI Origin 3900 systems. The L2 controller is a

5.5 in. x 11.1 in. PCB assembly that is mounted in the top of the rack. The L2 controller

does not use conﬁgurable rack space. It receives 48-VDC power (30 watts) from the

power bay.

L3 Controller

The L3 controller is a system-level controller. The L3 controller is SGI software that runs

on a stand-alone workstation or laptop computer. The L3 connects to the L2 controllers

via a 10BASE-T Ethernet hub. The L3 controller is optional.

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SGI Origin 3900 Specifications Page 33