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Component identification 12
System maintenance switch
The system maintenance switch (SW1) is a ten-position switch that is used for system configuration.
Position Description Function
S1
iLO security Off = iLO security enabled.
On = iLO security disabled.
S2
Configuration
lock
Off = Able to change system
configuration.
On = System configuration locked.
S3
Reserved Off = Tower
On = Rack
S4
Reserved Reserved
S5
Password
protection
override
Off = No function
On = Clears power-on password
and administrator password
S6
Invalidate
configuration
Off = Normal
On = ROM treats the system
configuration as invalid.
S7, S8, S9,
S10, S11,
S12
Reserved Reserved
When the system maintenance switch position 6 is set to the On position, the system is prepared to erase all
system configuration settings from both CMOS and NVRAM.
CAUTION: Clearing CMOS and/or NVRAM deletes configuration information. Be sure to
properly configure the server or data loss could occur.
NMI functionality
An NMI crash dump enables administrators to create crash dump files when a system is hung and not
responding to traditional debug mechanisms.
Crash dump log analysis is an essential part of diagnosing reliability problems, such as hangs in operating
systems, device drivers, and applications. Many crashes freeze a system, and the only available action for
administrators is to cycle the system power. Resetting the system erases any information that could support
problem analysis, but the NMI feature preserves that information by performing a memory dump before a
hard reset.
To force the OS to invoke the NMI handler and generate a crash dump log, the administrator can do either
of the following:
• Short the NMI jumper pins
• Use the iLO Virtual NMI feature
For more information, see the whitepaper on the HP website
(http://h20000.www2.hp.com/bc/docs/support/SupportManual/c00797875/c00797875.pdf).