User`s guide

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1: SGI Altix XE Cluster Quick-reference
SGI Altix XE250 and XE270 Node Front Controls and Indicators
The front control panel on the SGI Altix XE250 or XE270 head node or compute node (see
Figure 1-1) has six LED indicators to the left of the power and reset buttons. The LEDs provide
critical server related information. The two headnode models have virtually identical front panel
controlls although their internal circuitry and processors are different.
RESET
21
Power
Reset
Power fail
HDD
Overheat/Fan fail Power
NIC1/NIC2
Figure 1-1 SGI Altix XE250 or XE270 Front Control Panel
• HDD: Channel activity for the hard disk drive (HDD). This light indicates drive activity on
the node board when flashing.
• NIC1/NIC2: Indicates network activity on the LAN1 or LAN2 interconnect when flashing.
• Overheat/Fan fail: When the Overheat/Fan Fail LED flashes, it indicates that a fan has
failed. When the Overheat/Fan Fail LED is on continuously, it indicates that an overheat
condition has occurred, which may be caused by cables obstructing the airflow in the
system, covers removed, or the ambient room temperature being too warm.
• Power Fail: Indicates power is being supplied to the system’s power supply unit. This LED
should normally be illuminated when the system is operating.