Deployment Guide

Table 18. DDIC LED descriptions (continued)

Fault LED (Amber) Status/description*

Off Storage system: Degraded (non-critical)

Blinking: 3 s on/1 s off Storage system: Degraded (critical)

Off Storage system: Quarantined

Blinking: 3 s on/1 s off Storage system: Offline (dequarantined)

Off Storage system: Reconstruction

Off Processing I/O (whether from host or internal activity)

*If multiple conditions occur simultaneously, the LED state behaves as indicated in the previous table.

Each DDIC has a single Drive Fault LED. If the Drive Fault LED is lit amber, a disk fault is indicated. If a disk failure occurs, follow the

procedure in “Replacing a DDIC” in the Dell EMC PowerVault ME4 Series Storage System Owner’s Manual.

Controller module or IOM LEDs

• For information about controller module LEDs, see Controller module LEDs on page 75.

• For information about expansion module LEDs, see IOM LEDs on page 76.

Temperature sensors

Temperature sensors throughout the enclosure and its components monitor the thermal health of the storage system. Exceeding the

limits of critical values causes a notification to occur.

Module LEDs

Module LEDs pertain to controller modules and IOMs.

Controller module LEDs

Use the controller module LEDs on the face plate to monitor the status of a controller module.

Table 19. 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 a controller module” in the

Dell EMC PowerVault ME4 Series Storage System Owner’s

Manual

Off No external host port connection

On External host port connection – no activity

Blinking External host port connection – activity

Blinking System is booting

Actions:

• If the CRU OK LED is blinking, wait for the system to boot.

• If the CRU OK LED is off, and the controller module is powered on, the module has failed.

○ Check that the controller module is fully inserted and latched in place, and that the enclosure is powered on.

○ Check the event log for specific information regarding the failure.

• If the CRU Fault LED is on, a fault condition is detected.

○ Restart the controller module from the partner controller module using the PowerVault Manager or CLI.

○ If the restart does not resolve the fault, remove the controller module and reinsert it.

Troubleshooting and problem solving