Chapter 3: System Interface l Power Fail: Indicates a power supply unit has failed and will need replaced. Refer to Section 6-5 for details on replacing power supply units. This LED should be off when the system is operating normally. 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 6021H.) 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 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 P3TDER near the JA1 SCSI connector. 3-3