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System Controller Network
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System Controller Network
All Altix 450 enclosures contain an embedded microprocessor board and display assembly known
as the system controller. This microprocessor runs an embedded version of the Linux operating
system. The system controller runs off standby power and is running as long as the enclosure is
connected to an active power source.
There are two primary applications that run on the system controller. The L1, or Level 1 system
controller, is an application that provides control and monitoring functionality for each individual
rack unit enclosure (IRU), and communication to other L1s in adjacent enclosures connected via
NUMALink 4 cables. The L1 is always resident.
The console mode Level 2 (L2) system controller is an application that provides control over
multiple L1s and communication to other L2s. The L2 is resident and active when the enclosure
is connected by an Ethernet connection to a Local Area Network (LAN).
The system controller network provides the following functionality:
• Powering the entire system on and off.
• Powering individual IRUs on and off.
• Monitoring the environmental state of the system
• Viewing the system’s status and error message information generated and displayed by the
SGI system’s L1 controller.
• Enter L1 controller commands to monitor or change particular system functions. You can,
for example, monitor the speed of fans for a particular individual rack unit (IRU) enclosure.
See the SGI L1 and L2 Controller Software User’s Guide for a complete list of commands.
• Provides access to the system OS console allowing you to run diagnostics and boot the
system.