Lenovo 6446, 6447, 6445, 6444 manual Intermittent problems, the Hardware Maintenance Manual

Intermittent problems

vFollow the suggested actions in the order in which they are listed in the Action column until the problem is solved.

vSee the parts listing in the Hardware Maintenance Manual to determine which components are customer replaceable units (CRU) and which components are field replaceable units (FRU).

vIf an action step is preceded by “(Trained service technician only),” that step must be performed only by a trained service technician.

Symptom	Action
A problem occurs only	1. Make sure that:
occasionally and is difficult to
	v All cables and cords are connected securely to the rear of the server and
diagnose.	attached devices.
	Attention: In a dc power environment, only trained service personnel
	other than Lenovo service technicians are authorized to connect or
	disconnect power to the dc power supply. See the documentation that comes
	with each dc power supply.
	v When the server is turned on, air is flowing from the fan grille. If there is no
	airflow, the fans are not working. This can cause the server to overheat and
	shut down.
	2. Check the system event/error log or BMC system event log (see “ErrorLogs” in
	the Hardware Maintenance Manual).
The server resets (restarts)	1. If the reset occurs during POST and the POST watchdog timer is enabled (click
occasionally
	Advanced Setup --> Baseboard Management Controller (BMC) Setting -->
	BMC Post Watchdog in the Configuration/Setup Utility program to see the
	POST watchdog setting), make sure that sufficient time is allowed in the
	watchdog timeout value (BMC POST Watchdog Timeout). See the User Guide
	for information about the settings in the Configuration/Setup Utility program.
	If the server continues to reset during POST, see the “POST”and “Diagnostic
	programs” sections in the Hardware Maintenance Manual.
	2. If the reset occurs after the operating system starts, disable any automatic
	server restart (ASR) utilities, such as the IBM Automatic Server Restart IPMI
	Application for Windows, or ASR devices that may be installed.
	Note: ASR utilities operate as operating-system utilities and are related to the
	IPMI device driver.
	If the reset continues to occur after the operating system starts, the operating
	system might have a problem; see “Softwareproblems” on page 76.
	3. If neither condition applies, check the system event/error log or BMC system
	event log (see “ErrorLogs” in the Hardware Maintenance Manual).

Chapter 5. Solving problems 67