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System-board switches and jumpers

The following illustration shows the location and description of the switches and jumpers.

Figure 1. Location and description of switches and jumpers
Location and description of switches and jumpers
Note
If there is a clear protective sticker on the top of the switch blocks, you must remove and discard it to access the switches.
Note
  1. Before you change any switch settings or move any jumpers, turn off the server. Review the information in Safety, Installation guidelines, Handling static-sensitive devices, and Turning off the compute node.
  2. Any system-board switch or jumper block that is not shown in the illustrations in this document are reserved.

The following table describes the jumpers on the system board.

Table 1. System board jumpers
Jumper nameJumper setting
Clear CMOS jumper
  • Pins 1 and 2: Normal (default).
  • Pins 2 and 3: Clears the real-time clock (RTC) registry.
UEFI boot recovery jumper
  • Pins 1 and 2: Normal (default). Boots from the primary page.
  • Pins 2 and 3: Boots from the secondary (backup) page.
Note
  1. If no jumper is present, the server responds as if the pins are set to the default.
  2. Changing the position of the UEFI boot backup jumper (JP2) from pins 1 and 2 to pins 2 and 3 before the server is turned on alters which flash ROM page is loaded. Do not change the jumper pin position after the server is turned on. This can cause an unpredictable problem.