H3C UniServer R4900 G3, Руководство пользователя

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11
System maintenance switches
Use the system maintenance switches if you forget HDM username, HDM password, or BIOS
password, or need to restore default BIOS settings, as described in
Table 7 . To identify the location of
the switches on the system board, see Figure 10 .
Table 7 System maintenance switches
Item Description Remarks
System
maintenance
switch 1
•
Pins 1-2 jumped (default) —HDM login
requires the username and password of
a valid HDM user account.
•
Pins 2-3 jumped —HDM login requires
the default username and password.
For security purposes, jump pins 1 and 2
after you complete tasks with the default
username and password as a best
practice.
System
maintenance
switch 2
•
Pins 1-2 jumped (default) —Normal
server startup.
•
Pins 2-3 jumped —Clears all passwords
from the BIOS at server startup.
To clear all passwords from the BIOS,
jump pins 2 and 3 and then start the
server. All the passwords will be cleared
from the BIOS. Before the next server
startup, jump pins 1 and 2 to perform a
normal server startup.
System
maintenance
switch 3
•
Pins 1-2 jumped (default) —Normal
server startup.
•
Pins 2-3 jumped —Restores the default
BIOS settings.
To restore the default BIOS settings, jump
pins 2 and 3 for over 30 seconds and then
jump pins 1 and 2 for normal server
startup.
DIMM slots
The server provides 6 DIMM channels per processor, 12 channels in total. Each channel contains
one white-coded slot and one black-coded slot, as shown in
Table 8 .
Table 8 DIMM slot numbering and color-coding scheme
Processor DlMM slots
Processor 1
A1 through A6 (white coded)
A7 through A12 (black coded)
Processor 2
B1 through B6 (white coded)
B7 through B12 (black coded)
Figure 11 shows the physical layout of the DIMM slots on the system board. For more information
about the DIMM slot population rules, see the guidelines in "Installing DIMMs."