Chapter 3: System Interface l Power: Indicates power is being supplied to the system's power supply units. This LED should normally be illuminated when the system is operating. 3-4 SCSI Drive Carrier LEDs A SCSI drive carrier has two LEDs. l Green: When illuminated, the green LED on the front of the SCSI drive carrier indicates drive activity. A connection to the SCSI SCA backplane enables this LED to blink on and off when that particular drive is being accessed. l Red: A SAF-TE compliant backplane is needed to activate the red LED to indicate a drive failure.
(A SAF-TE compliant SCSI backplane is optional on the 6011L.) If one of the SCSI drives fail, you should be notified by your system management software. Please refer to Section 6-4 for instructions on replacing failed SCSI drives. 3-5 Power Supply Switch An on/off switch is located on the back of the power supply. This switch should normally be on at all times. Turning this switch to the off position removes both the main and standby power from the system, as opposed to the power button located on the control panel on the front of the chassis. 3-6 Motherboard LED There is only one LED on the motherboard. When illuminated, it indicates that system power is present on the motherboard.
This LED is located in the corner of the P3TDLR near the IDE #1 connector. 3-3