User`s guide

Product Description 15
Product Description
Status Indicators
LEDs on the disk system enable you to detect and replace failed components and
so prevent or minimize users’ downtime. For additional information about LEDs,
see Chapter 4, Troubleshooting.
On the front of the disk system, a pair of LEDs indicates the status of the disk
system, and an LED for each slot shows disk I/O activity:
■ The system power LED (B in Figure 1) indicates that power is on or off.
■ The system fault LED (C in Figure 1) indicates whether or not a fault has
occurred anywhere in the disk system.
■ At the bottom of each disk module, the left LED (F in Figure 1) indicates the
presence of I/O activity on the disk.
■ The second LED on each disk module (E in Figure 1) can be flashed to help a
customer engineer (CE) locate the disk for physical inspection or removal.
■ The second LED is also used as a fault indicator for that specific disk module.
LEDs (I and K in Figure 2) on the back of the disk system indicate the status of
replaceable components and the SCSI bus: See Chapter 4, Troubleshooting, for
specific LED information.