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System status LEDs: The LEDs on this part of the panel provide status
information for the BladeCenter T unit.
v Power: When continuously lit, this green LED indicates the presence of power in
the BladeCenter T unit. The LED turns off when the power source is interrupted.
Attention: If the power LED is off, it does not mean electrical power is not
present in the BladeCenter T unit. The LED might be burned out. To remove all
electrical power from the BladeCenter T unit, you must disconnect all power
cords from the rear of the BladeCenter T unit.
v Location: This blue LED is for system identification. A system administrator or
servicer uses this LED to locate a specific BladeCenter T unit for service or
repair. You can turn off the location LED through the Web interface or a remote
management console.
Alarm LEDs: These LEDs provide alarm notifications for the BladeCenter T unit.
v CRT (Critical alarm, amber (default) or red): When continuously lit, this LED
indicates the presence of a critical system fault. The system comes with amber
as the default. See the BladeCenter T Management Module User’s Guide for
information on setting the color of this LED.
A critical system fault is an error or event that is unrecoverable. In this case, the
system cannot continue to operate. An example is the loss of a large section of
memory that causes the system to be incapable of operating.
v MJR (Major alarm, amber (default) or red): When continuously lit, this LED
indicates the presence of a major system fault. The system comes with amber as
the default. See the BladeCenter T Management Module User’s Guide for
information on setting the color of this LED.
A major system fault is an error or event that has a discernible impact to system
operation. In this case, the system can continue to operate but with reduced
performance. An example is the loss of one of two mirrored disks.
v MNR (Minor alarm, amber): When continuously lit, this LED indicates the
presence of a minor system fault. A minor system fault is an error or event that
has little impact to system operation. An example is a correctable ECC error.
USB
connectors: There are two USB connectors on the front system-status panel.
You can use these USB connectors to connect two USB peripheral devices without
an external hub. If more devices are required, you can connect an external hub to
any of the built-in connectors.
12 BladeCenter T Type 8720 and 8730: Hardware Maintenance Manual and Troubleshooting Guide