HP ProLiant ML150 Gen9 - System Maintenance Switch; NMI Functionality

Component identification 72
Item Description
26
Fan connector 2
27
System battery
28
NMI header
29
microSD slot
30
Dedicated iLO port connector
31
Slot 6 PCIe3 x8 (8, 4, 1) for Processor 1
32
Slot 5 PCIe3 x16 (16, 8, 4, 1) for Processor 1
33
Slot 4 PCIe3 x8 (8, 4, 1) for Processor 1
34
Slot 3 PCIe3 x16 (16, 8, 4, 1) for Processor 2
35
Slot 2 PCIe3 x8 (8, 4, 1) for Processor 1
36
Slot 1 PCIe3 x8 (8, 4, 1) for Processor 2
System maintenance switch
Position Default Function
S1
Off
Off = iLO 4 security is enabled.
On = iLO 4 security is disabled.
S2
Off
Off = System configuration can be
changed.
On = System configuration is locked.
S3
Off
Reserved
S4
Off
Reserved
S5
Off
Off = Power-on password is enabled.
On = Power-on password is disabled.
S6
Off
Off = No function
On = ROM reads system
configuration as invalid.
S7
Off
Off = Set default boot mode to UEFI.
On = Set default boot mode to legacy.
S8
—
Reserved
S9
—
Reserved
S10
—
Reserved
S11
—
Reserved
S12
—
Reserved
To access the redundant ROM, set S1, S5, and S6 to on.
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.
IMPORTANT: Before using the S7 switch to change to Legacy BIOS Boot Mode, be sure the
HPE Dynamic Smart Array B140i Controller is disabled. Do not use the B140i controller when
the server is in Legacy BIOS Boot Mode.
NMI functionality
An NMI crash dump creates a crash dump log before resetting a system which is not responding.
Crash dump log analysis is an essential part of diagnosing reliability problems, such as failures of
operating systems, device drivers, and applications. Many crashes freeze a system, and the only