HP ProLiant ML570 G4 Server - Manual (Page 13)

Component identification 13
NMI switch
The NMI switch allows administrators to perform a memory dump before performing a hard reset. Crash
dump analysis is an essential part of eliminating reliability problems, such as hangs or crashes in
operating systems, device drivers, and applications. Many crashes freeze a system, requiring you to do a
hard reset. Resetting the system erases any information that would support root cause analysis.
Systems running Microsoft® Windows® operating systems experience a blue screen trap when the
operating system crashes. When this happens, Microsoft® recommends that system administrators
perform an NMI event by pressing a dump switch. The NMI event enables a hung system to become
responsive again.
System LEDs and internal health LED combinations
When the internal health LED on the front panel illuminates either flashing amber or flashing red, the
server is experiencing a health event. Combinations of illuminated system LEDs and the internal health LED
indicate system status.
NOTE: The system management driver must be installed in order for the internal health LED to provide pre-
failure and warranty conditions.
The front panel health LEDs indicate only the current hardware status. In some situations, HP SIM may
report server status differently than the health LEDs because the software tracks additional system
attributes.
System LED and color Internal health LED
color Status
Processor failure,
socket X (amber) Flashing red One or more of the following conditions may exist:
• Processor in socket X has failed.
• Processor X is not installed in the socket.
• ROM detected a failed processor during POST.
Processor failure,
socket X (amber) Flashing amber Processor in socket X is in a pre-failure condition.
PPM failure, slot X
(amber) Flashing red • PPM in slot X has failed.
• PPM is not installed in slot X, but the corresponding
processor is installed.
DIMM failure, slot X
(amber) Flashing red • DIMM in slot X has failed.
• DIMM has experienced a multi-bit error.
DIMM failure, slot X
(amber) Flashing amber • DIMM in slot X has reached single-bit correctable
error threshold.
• DIMM in slot X is in a pre-failure condition.
DIMM bank error (all
slots in one bank,
amber) Flashing red The bank is not populated entirely or DIMMs do not all
match within the bank.
DIMM failure (all
slots, amber) Flashing red • No valid or usable memory is installed in the system.
• The banks are not populated in the correct order.
System temperature
alert (amber) Flashing red System temperature has exceeded OS cautionary level or
critical hardware level.
Fan (amber) Flashing red A required fan has failed.
Fan (amber) Flashing amber A redundant fan has failed.