98 Troubleshooting and problem solving
Figure 75 LEDs: Drive carrier LEDs (SFF and LFF modules)
IOM LEDs
IOM LEDs pertain to controller modules and expansion modules, respectively. Expansion enclosures are supported
for optionally adding storage. See also “12Gb/s controller module LEDs” (page 43).
Controller module LEDs
Disk Activity LED
(Green)
Disk Fault LED
(Amber)
Status/condition*
Off Off Off (disk module/enclosure)
Off Off Not present
Blink off with activity Blinking: 1s on/1s off Identify
1 down: Blink with
activity
2 down: Off
On Drive link (PHY lane) down
On On Fault (leftover/failed/locked-out)
Blink off with activity Off Available
Blink off with activity Off Storage system: Initializing
Blink off with activity Off Storage system: Fault-tolerant
Blink off with activity Off Storage system: Degraded (not critical)
Blink off with activity Blinking: 3s on/1s off Storage system: Degraded (critical)
On Off Storage system: Quarantined
Blink off with activity Blinking: 3s on/1s off Storage system: Offline (dequarantined)
Blink off with activity Off Storage system: Reconstruction
Blink off with activity Off Processing I/O (whether from host or internal activity)
*If multiple conditions occur simultaneously, the LED state will behave as indicated by the condition listed earliest in the
table, as rows are read from top to bottom.
Table 15 Controller module LED states
CRU OK
(Green)
CRU Fault
(Amber)
External host
port activity
(Green)
Status
On Off Controller module OK
Off On Controller module fault – see “Replacing an IOM” (page 127)
Off No external host port connection
On External host port connection – no activity
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