Dell PowerVault ME5 Series Storage System Deployment Guide

IO Module LEDs

IOM status is monitored by the LEDs located on the face plate. The following table describes LED behaviors for expansion enclosure IOMs.

Table 1. Expansion enclosure IOM LEDs
Description	Color	Status
Module fault	Amber	On Ops panel undergoing 5s test Rear panel area module fault: IOM, fan, PSU, when paired with module fault LED Drive module hardware fault, paired with drive fault LED
		Flashing Unknown, invalid, or mixed module type, such as drive module or PSU Vital product data (VPD) configuration error or I2C bus failure
		Off—IOM functioning properly
Power on or standby	Green	On—IOM power is on
	Amber	On—Part of standby sequence as IOM comes online
	None	Off—IOM power is off
Unit identification (UID)	White	On—UID active to locate or identify for service activity
Unit identification (UID)	White	Off—UID not active
12 Gb/s SAS port	Green	On—Connected, link is up
	Green	Off—Not connected or link is down
	Amber	On—Critical SAS cable fault
		Fast flash (1s:1s)—SAS UID active
		Slow flash (3s:1s)—Non-critical SAS cable fault
		Off—SAS expansion port functioning properly
Ethernet port	---	Ethernet port is disabled