Integrated Lights-Out

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What Does Integrated Lights-Out Mean?

Integrated Lights-Out (iLO) is a remote server management processor embedded on the system boards of HP ProLiant and Blade servers that allows controlling and monitoring of HP servers from a remote location. HP iLO management is a powerful tool that provides multiple ways to configure, update, monitor, and run servers remotely.


The embedded iLO management card has its own network connection and IP address to which server administrators can connect via Domain Name System (DNS)/Dynamic Host Configuration Protocol (DHCP) or through a separate dedicated management network. iLO provides a remote Web-based console, which can be used to administer the server remotely. The iLO port is an Ethernet port, which can be enabled through the ROM-Based Setup Utility (RBSU).

Techopedia Explains Integrated Lights-Out

iLO comes preconfigured with proLiant servers of the 300 series and above. A default iLO user account and password is included. iLO can be configured through several ways including:

  • Browser-based configuration.
  • iLO RBSU accessed using the F8 key during power-on self-test (POST).
  • Remote scripted configuration.
  • Local on-line and local scripted setup.

The iLO management tool allows a user to perform the following actions on the server remotely:

  • Power on and power off the server.
  • Restart the server.
  • Monitor the server, regardless of the state of the server’s operating system.
  • Measure power usage.
  • Apply patches, firmware updates, and critical virus updates through virtual media and virtual folders.
  • Access system event logs and the HP Integrated Management Log.

HP 100 series servers include the Lights-Out 100 Remote Management Option with limited features. HP iLO has now been replaced by Integrated Lights-Out Advanced (known as iLO2 and iLO3). The latest releases of HP Integrated Lights-Out 2 (iLO2) and Lights-Out 3 (iLO3) have simplified the server setup process and enabled remote power and thermal optimization. As of Aug 2011, the current firmware versions of iLO 2 and iLO 3 are 2.07 and 1.26, respectively.


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Margaret Rouse
Technology Expert
Margaret Rouse
Technology Expert

Margaret is an award-winning technical writer and teacher known for her ability to explain complex technical subjects to a non-technical business audience. Over the past twenty years, her IT definitions have been published by Que in an encyclopedia of technology terms and cited in articles by the New York Times, Time Magazine, USA Today, ZDNet, PC Magazine, and Discovery Magazine. She joined Techopedia in 2011. Margaret's idea of a fun day is helping IT and business professionals learn to speak each other’s highly specialized languages.