HP ProLiant DL580 Gen9, Maintenance And Service Manual

Page: 85 / 108

Component identification 85
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, Hewlett Packard Enterprise
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.