NonStop NS-Series Operations Guide (H06.03+)

Overview of Monitoring and Recovery
HP Integrity NonStop NS-Series Operations Guide—529869-001
3-20
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 (page1of3)
Location LED Name Color Function
Disk drive Power-on Green Lights when the disk drive is receiving
power.
Activity Yellow or
amber
Lights when the disk drive is executing a
read or write command.
Disk drive, fibre-
channel
Drive Ready
(top green)
Green Flashes when drive is starting. (At the
same time, the middle green light is lit
and the bottom amber light is lit.)
Drive Online
(middle green)
Green Flashes when drive is operational and
performing a locate function.
Drive Failure
(bottom amber)
Amber Flashes when drive is inactive or in error
condition. When this occurs, verify the
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 enclo-
sure 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.