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Component identification 79
System maintenance switch
The system maintenance switch (SW1) is an eight-position switch that is used for system configuration. The
default position for all eight positions is Off.
Position Description Function
S1
iLO 3 security Off = iLO 3 security is enabled.
On = iLO 3 security is disabled.
S2
Configuration
lock
Off = System configuration can be
changed.
On = System configuration is
locked.
S3
Reserved Reserved
S4
Reserved Reserved
S5
Password
protection
override
Off = No function
On = Clears power-on password
and administrator password
S6
Invalidate
configuration
Off = Normal
On = Clears NVRAM
S7
Reserved Reserved
S8
Reserved Reserved
NMI jumper
The NMI jumper 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 OSs, device
drivers, and applications. Many crashes can 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® experience a blue-screen trap when the OS crashes. When this
happens, Microsoft® recommends that system administrators perform an NMI event by temporarily shorting
the NMI header with a jumper. The NMI event enables a hung system to become responsive again.