I use my HP Microservers as NAS style boxes running Ubuntu or Truenas, and keeping power consumption low is an important consideration for me. Since I don’t have a license for iLO, it is mostly useless to me, so I wanted to disable it to save a few watts of power.
To disable iLO:
- Enter iLO RBSU: Press F8 during the Power-On Self-Test (POST) to access the iLO configuration utility.
- Navigate to Configuration Settings: Select Settings -> Configure, and press Enter.
- Modify iLO Functionality: Select the iLO Functionality option and press the Spacebar to toggle the setting between ENABLED and DISABLED. A warning message will be displayed when selecting DISABLED.
- Save Configuration: Press F10 to save the modified settings.
- Exit iLO RBSU: Select File -> Exit to close the utility.
When managing iLO (Integrated Lights-Out) functionality on HP servers, disabling and re-enabling iLO requires specific steps involving both RBSU (ROM-Based Setup Utility) and the system board’s iLO Override Switch.
To re-enable iLO using the Security Override Switch:
- Power down the server completely.
- Set the S1 system maintenance switch to the ON position.
- Power on the server and wait for the F8 prompt to appear. Press F8 to enter iLO RBSU.
- Re-enable iLO through the configuration utility.
- Power off the server again.
- Return the S1 switch to its default OFF position.
Important Notes:
- The System Maintenance Switch S1 controls iLO security.
- By default, the switch remains in the OFF position, which means HP iLO security is enabled.
- The iLO Security Override Switch uses switch #1 on the DIP switch panel.