IBM Partner Pavilion DS4100 manual Supplies. If applicable, check

Table 17. Symptom-to-FRU index (continued)

Problem
indicator	Component	Possible cause	Possible solutions
One or more	Expansion loop	Drives are	Ensure that the drives are
green LEDs off		improperly	properly installed.
(continued)		installed or not
		installed
		RAID controller	Ensure that the unit is powered
		has no power or	on. Replace the RAID controller.
		has failed
		Impending drive	A bad drive or drives can issue
		failure	LIPs that cause the drive
			expansion loop to go down
			momentarily. Use the RLS
			function in the DS4000 Storage
			Manager client to determine
			which drives are bad. Replace
			the bad drives.
		Externally	Replace the expansion unit SFP
		attached	or fibre-channel cable.
		expansion port
		device has failed
Intermittent or	Some or all CRUs	Defective ac	Check the ac power source;
sporadic power		power source or	verify that the ac circuit that the
loss to the storage		partially	storage server connects to is not
server		plugged-in power	being overloaded. Reseat all
		cord	installed power cables and power
			supplies. If applicable, check the
			power components. Replace
			defective power cords.
		Power supply	Check for a Fault LED on the
		has failed	power supply, and replace the
			failed CRU.
		Midplane has	Have the midplane replaced
		failed	(service technician only).
Unable to access	Drives and	Fibre-channel	Ensure that the fibre-channel
drives	expansion loop	cabling has	cables are undamaged and
		failed.	properly connected.
		RAID controller	Replace the RAID controller.
		has failed
		SFP has failed	Ensure SFP is seated properly;
			replace SFP.
Random errors	Subsystem	Midplane has	Have the midplane replaced
		failed	(service technician only).

114IBM TotalStorage DS4100 Storage Server: Installation, User’s, and Maintenance Guide