System Control - Silicon Graphics Origin 300 User Manual

4: System Configurations

System Control

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The control system for the SGI Origin 300 system with NUMAlink module manages
power control and sequencing, provides environmental control and monitoring, initiates
system resets, and stores identification and configuration information. The SGI Origin
300 system with NUMAlink module has two levels of control:
• L1: module-level controller. The L1 controller is designed into all modules except
the TP900 storage module; controller function varies slightly by module. The L1
controllers are not configurable.
• L2: rack-level controller. The L2 controller enables remote maintenance. It controls
resource sharing and the L1 controllers in the system, and maintains controller
configuration and topology information. The L2 controller resides in the top portion
of the rack.
The L1 controllers within the system communicate with the L2 controller via the
NUMAlink module or via a USB hub (refer to Figure 4-3). The Origin 300 base modules
and/or PCI expansion modules that connect to ports 2, 3, 4, and 5 of the NUMAlink
module communicate with the L2 controller via the USB signals of these NUMAlink
ports. The Origin 300 base modules that connect to ports 1, 6, 7, and 8 of the NUMAlink
module communicate with the L2 controller via a USB hub.
You can access the L1 and L2 controllers via the system console. Refer to Appendix C for
L1 and L2 controller commands.
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