SAS link up LED (green)
When this LED is lit, it indicates that the link is established between the controller and a host.
When this LED is flashing, it indicates activity on the link. When this LED is off, no link is
established.
ESM LEDs
This section describes the ESM LEDS. Figure 53 shows the LEDs on the ESM.
Link fault LED (amber)
When this amber LED is lit, it indicates that the link through the SAS cable is not successful.
Link up LED (green)
When this green LED is lit, it indicates that the link through the SAS cable is successful.
OK to remove LED (blue)
This LED is supported only when the EXP3500 is attached to a DS3500 controller. Do not remove
the ESM unless this blue LED is lit.
Fault LED (amber)
When this amber LED is lit, it indicates that the ESM has failed.
Power-on LED (green)
When this green LED is lit, it indicates that the ESM is receiving power.
Fan assembly LEDs
This section describes the storage expansion enclosure fan assembly LEDs.
1 2
ESM
Link fault LED
(amber)
Link up LED
(green)
OK to remove LED
(blue)
Fault LED
(amber)
Power-on LED
(green)
Link fault LED
(amber)
Link up LED
(green)
Seven-segment
numeric display
Figure 53. ESM LEDs
76 IBM System Storage DCS3700: Installation, User, and Maintenance Guide
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