Dell PowerVault ME4 Series Storage System Deployment Guide

Module LEDs

Module LEDs pertain to controller modules and IOMs.

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

Table 1. 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 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.
If the previous actions do not resolve the fault, contact your supplier for assistance. Controller module replacement may be necessary.

Use the IOM LEDs on the face plate to monitor the status of an IOM .

Table 2. IOM LED states
CRU OK (Green)	CRU Fault (Amber)	External host port activity (Green)	Status
On	Off	—	Controller module OK
Off	On	—	IOM module fault – see “Replacing an IOM” in the Dell PowerVault ME4 Series Storage System Owner’s Manual
—	—	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

Actions:

If the CRU OK LED is off, and the IOM is powered on, the module has failed.
- Check that the IOM 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 this IOM using the PowerVault Manager or CLI.
- If the restart does not resolve the fault, remove the IOM and reinsert it.
If the previous actions do not resolve the fault, contact your supplier for assistance. IOM replacement may be necessary.