HP ProLiant DL580 Gen8 Server - Manual (Page 12)

Component identification 12
System maintenance switch
The system maintenance switch (SW1) is a twelve-position switch that is used for system configuration. The
default position for all twelve positions is Off.
Switch Settings
1 Off = iLO security enabled
On = iLO security disabled
2 Off = Normal operation
On = The BIOS configuration is locked.
5 Off = Normal operation
On = Password disabled
6 Off = Normal operation
On = Clear CMOS and RAM
7* Off = Set factory default boot mode to UEFI.
On = Set factory default boot mode to Legacy.
3, 4, 8, 9, 10, 11,
12 Reserved
* The default position for switch 7 is set in the factory shipping configuration. This switch setting determines the BIOS
mode the system defaults to when configuration memory is cleared to factory defaults. The User defined defaults setting
in UEFI System Utilities supersedes this switch.
IMPORTANT: To avoid a mismatch between boot modes, HP recommends setting system
maintenance switch 7 to the same BIOS boot mode the server is deployed in. Otherwise, the
storage controller may not recognize the OS installed on the storage media.
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.