IBM DCS9550 1S1 manual Thermal Alarm, Thermal Shutdown, Drive Carrier Module Faults

Troubleshooting and Problem Solving

4.5.4Thermal Alarm

	Symptom	Cause		Action
1	Ops Panel FAULT	If the internal	1	Check local ambient environment
	LED AMBER.	temperature measured in		temperature is below the upper 40°C
2	An AMBER LED on	the airflow through the		specification.
		enclosure exceeds a pre-	2	Check the installation for any airflow
	one or more Power	set threshold a thermal
	Supply/Cooling	alarm will sound.		restrictions at either the front or rear
	Modules.			of the enclosure. A minimum gap of
				25mm at the front and 50mm at the
3	Audible Alarm			rear is recommended.
	Sounding.
4	Air temperature		3	Check for restrictions due to dust
				build-up, clean as appropriate.
	exiting PSU above
	55°C.		4	Check for excessive re-circulation of
				heated air from rear to the front, use
				in a fully enclosed rack installation is
				not recommended.
			5	If possible shutdown the enclosure
				and investigate the problem before
				continuing.

4.5.5Thermal Shutdown

Important For thermal warnings please refer to the SES specification.

An Enclosure will shut down when a critical temperature threshold is exceeded in order to prevent permanent damage to the disk drives.

4.6Drive Carrier Module Faults

Disk drive status is monitored by a Green LED and an Amber LED mounted on the front of each Drive Carrier Module, providing the following indications:

Table 4–4LED Functions

State	Green	Amber
No drive fitted	Off	Off
Drive Power ON	On	Off
Drive Activity	On/Blink off	Off
Drive Fault	On	On

Drive activity - LED may be off for a length of time during power up.

44 IBM System Storage DCS9550 1S1 Storage Expansion Unit Installation, Service, and User Guide