HP NonStop NS Using the Status LEDs to Monitor the System, Status LEDs and Their Functions page 1

Overview of Monitoring and Recovery Using the Status LEDs to Monitor the System

Using the Status LEDs to Monitor the System

Status LEDs on the various enclosures and system components light during certain operations, such as when the system performs a series of power-on self-tests (POSTs) when a server is first powered on. Table 3-4 lists some of the status light-emitting diodes (LEDs) and their functions.

Table 3-4. Status LEDs and Their Functions (page 1 of 3)

Location	LED Name	Color	Function
Disk drive	Power-on	Green	Lights when the disk drive is receiving
			power.
	Activity	Yellow or	Lights when the disk drive is executing a
		amber	read or write command.
Disk drive, fibre	Drive Ready	Green	Flashes when drive is starting. (At the
channel	(top green)		same time, the middle green light is lit and
			the bottom amber light is lit.)
	Drive Online	Green	Flashes when drive is operational and
	(middle green)		performing a locate function.
	Drive Failure	Amber	Flashes when drive is inactive or in error
	(bottom		condition. When this occurs, verify the
	amber)		loop and replace the drive, if necessary.
	All		If all lights are on and none are flashing,
			the drive is not operational. Perform the
			following actions:
			1. Check FCSA. Replace if defective.
			2. Check FC-AL I/O module. Replace if
			defective.
			3. Replace drive.
EMU	Heartbeat	Left Green	Flashes when EMU is operational and
			performing locate. Power might just have
			been applied to the EMU, or an enclosure
			fault might exist.
			On when an EMU fault exists that is not
			an enclosure fault.
			Off when an EMU fault exists, which could
			be or might not be an enclosure fault.
	Power	Middle	Flashes when EMU is operational and
		Green	performing locate.
			On when EMU is operational. An EMU or
			an enclosure fault might still exist.
			Off when power has just been applied to
			an enclosure, or when an enclosure fault
			exists.

HP Integrity NonStop NS-Series Operations Guide—529869-005

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