Activity LED (Green) Fault LED (Amber) Status/condition*
*If multiple conditions occur simultaneously, the LED state behaves as indicated by the condition listed earliest in the table, as rows are
read from top to bottom.
Controller module and IOM LEDs
Controller module and IOM LEDs pertain to controller modules and expansion modules, respectively.
• For information about controller module LEDs, see 12 Gb/s controller module LEDs.
• For information about IOM LEDs, see Expansion enclosure IOM LEDs.
Expansion enclosure IOM LEDs
Expansion enclosure IOM status is monitored by the LEDs located on the face plate. See Figure 17. IOM detail – ME412/ME424/ME484.
LED behaviors for expansion enclosure IOMs are described in the following table. For actions pertaining to Cache status LED details or
Table 14. Expansion enclosure IOM LED states, see Fault isolation methodology.
Table 14. Expansion enclosure IOM LED states
CRU OK
(Green)
CRU Fault
(Amber)
External host port
activity (Green)
Status
On Off IOM OK
Off On IOM fault – see Replacing a Controller Module or IOM
Off No external host port connection
On HD mini-SAS port connection – no activity
Blinking HD mini-SAS port connection – activity
Blinking EBOD VPD error
5U84 enclosure LEDs
When the 5U84 enclosure is powered on, all LEDs turn on for a short period to ensure that they are working.
NOTE:
This behavior does not indicate a fault unless LEDs remain lit after several seconds.
PSU LEDs
See Power supply module for a visual description of the Power Supply Unit (PSU) module faceplate.
Table 15. PSU LED states
CRU Fail
(Amber)
AC Missing
(Amber)
Power
(Green)
Status
On Off Off No AC power to either PSU
On On Off PSU present, but not supplying power or PSU alert state. (usually due to critical
temperature)
Off Off On Mains AC present, switch on. This PSU is providing power.
Off Off Blinking AC power present, PSU in standby (other PSU is providing power).
Blinking Blinking Off PSU firmware download in progress
Off On Off AC power missing, PSU in standby (other PSU is providing power).
On On On Firmware has lost communication with the PSU module.
On -- Off PSU has failed. Follow the procedure in Replacing a power supply unit (PSU).
Troubleshooting and problem solving 33
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