C H A P T E R  6

Checking LEDs

This chapter describes the front-panel and back-panel LEDs, which give the clear status of the operation of all drives and modules. Topics covered in this chapter include:


6.1 LEDs When Array Is First Powered On

With the array powered on without the SCSI bus configuration cable installed while the array is not connected to a server, you should see the LED conditions described in TABLE 6-1 and TABLE 6-2.

TABLE 6-1 Front-Panel LED Status When Array Is First Powered On

Drive LEDs

Solid green

Chassis ear LEDs

Solid green


TABLE 6-2 Back-Panel LED Status When Array Is First Powered On (1 of 2)

I/O Module:

 

ERROR LED

Blinking green (no bus configuration; invalid state)

TERM LED

Solid green (autotermination enabled)

Inactive (no bus configuration; invalid state)

Power/fan module LEDs

Solid green



6.2 Front-Panel LEDs

The drive LEDs are located between the rows of drives on the front panel (see the following figure). The system operation LEDs are located on the right ear of the chassis.

 FIGURE 6-1 Front-Panel LEDs

Figure showing the LEDs on the front panel.

The following figure shows the front-panel LEDs and Reset button.

Use the Reset button to silence an alarm. For alarm details, see Silencing Audible Alarms.

 FIGURE 6-2 Chassis Ear LEDs and Reset Button on Front Panel

Figure showing the Reset button and the following LEDs: power, fan, temp, and event.

The following table lists the front-panel LEDs.

TABLE 6-3 Front Panel LEDs

LED

LED Color

Description

Drive

Solid green

Blinking green

Solid amber

Good: Drive power-up and spin-up OK.

Good: Drive activity.

Failed: Drive failure.

Power (Light bulb icon)

Monitors the DC output voltage within tolerance specification. Overcurrent protection shutting down any voltage output displayed.

Voltage thresholds:

+5 VDC +/-.25 VDC

+12 VDC +/-.6 VDC

Current thresholds:

+5 VDC 35A

+12 VDC 25A

 

Solid green

Solid amber

 

Power supply good.

Failed: One or more output voltages out of range.

Temp (Thermometer icon)

Monitors the temperature level and indicates violations of internal temperature thresholds of 55C and 60C.

 

Solid green

Solid amber

 

Good: Under temperature threshold of 55C.

Failed: Temperature threshold equal to or over 55C.

Event (Caution icon)

Indicates any abnormal or failure event.

 

Solid green

Solid amber

 

Normal operation.

Abnormal environment event.

 




Note - To test that the front-panel LEDs work, press and hold the Reset button for 5 seconds. All the LEDs should change from green to amber when you perform this test. Any LED that fails to light indicates a problem with the LED. When you release the Reset button, the LEDs return to their initial state.




6.3 Back-Panel LEDs

The back-panel LED colors indicate the conditions described in the following figures and tables. The following figure is the back-panel with LEDs.

 FIGURE 6-3 Back-Panel LEDs

Figure showing the back view of a JBOD array.

Figure showing the back view of a JBOD array.

Figure showing the back view of a JBOD array.
TABLE 6-4 Back-Panel Module LEDs

Module

LED Color

Status

Power supply/fan

Monitors the DC output voltage within tolerance specification. Overcurrent protection shutting down any voltage output will also be displayed.

Voltage thresholds:

+5 VDC +/-.25 VDC

+12 VDC +/-.6 VDC

Current Thresholds:

+5 VDC 35A
+12 VDC 25A


Solid green

Solid amber

Solid green

Solid amber


Power supply good.

Failed: one or more output voltages out of range.

Good fan: Over 900 RPM.

Faulty/failed: Under 900 RPM.

I/O module

TERM LEDs

 

 

ERROR LED


 


Solid green

Inactive LED

 

Blinking green

Solid amber

Inactive LED


Autotermination enabled.

Autotermination disabled.

 

Invalid single- or dual-cable configuration.

Failed I/O module.

Valid single- or dual-bus configuration, and I/O module is good.




caution icon

Caution - If you see a blinking green or amber LED, you might have an incorrect configuration or a failed component.



The AC and DC power supply and fan modules have a single LED.

 FIGURE 6-4 AC Power Supply and Fan Module

Figure showing the AC power supply and fan module.

 FIGURE 6-5 DC Power Supply and Fan Module

Figure showing the DC power supply and fan module.

The I/O modules for JBOD units have TERM and ERROR LEDs.

 FIGURE 6-6 JBOD I/O Module

Figure showing the JBOD I/O module.