The LOM port ''(Lights Out Management port)'' is a
remote access facility on a
Sun Microsystems
Sun Microsystems, Inc. (Sun for short) was an American technology company that sold computers, computer components, software, and information technology services and created the Java programming language, the Solaris operating system, ZFS, the ...
server. When the main processor is switched off, or when it is impossible to
telnet
Telnet is an application protocol used on the Internet or local area network to provide a bidirectional interactive text-oriented communication facility using a virtual terminal connection. User data is interspersed in-band with Telnet control i ...
to the server, an operator would use a link to the LOM port to access the server. As long as the server has power, the LOM facility will work, regardless of whether or not the main processor is switched on.
To use the LOM port, a
rollover cable
Rollover cable (also known as a Yost cable, Cisco cable, or a Console cable) is a type of null-modem cable that is used to connect a computer terminal to a router's console port. This cable is typically flat (and has a light blue color) to help ...
is connected to the LOM port, which is located at the back of the Sun server. The other end of the cable is connected to a terminal or a
PC running a
terminal emulator
A terminal emulator, or terminal application, is a computer program that emulates a video terminal within some other display architecture. Though typically synonymous with a shell or text terminal, the term ''terminal'' covers all remote termin ...
. The terminal or emulator must be set to a transmission rate of 9600 bits per second, and hardware
flow control enabled.
Useful commands include:
Specific implementations:
* Advanced Lights Out Management (ALOM), Sun Microsystems-specific and comes standard on newer Sun servers (
SunFire V125/V210/V215/V240/V245/V250/V440/T1000/T2000,
Sun Netra 210/240/440).
* Integrated Lights Out Management (ILOM), Sun Microsystems's ALOM replacement on Sun x64 server SunFire X4100(M2)/X4200(M2)/X4600(M2)/X4140/X4240/X4440/X4150/X4250/X4450/X4170/X4270/X2250/X2270, Sun Blade 6000 Chassis Management Module/Blade Module(X6220/X6420/X6240/X6440/X6250/X6450/X6270/X6275), Sun CMT servers/blades (Sun T5120, T5220, T5240, T6340, T6320). Not to be confused with the similar-sounding
HP Integrated Lights-Out
Integrated Lights-Out, or iLO, is a proprietary embedded server management technology by Hewlett-Packard Enterprise which provides out-of-band management facilities. The physical connection is an Ethernet port that can be found on most ProLian ...
management technology.
* Lomlite and Lomlite2 Single-chip implementations on the Netra T1 and possibly others. In the cases of the T1-200 and X1, the
OpenBoot firmware implements lom@ and lom! commands allowing access to the registers representing temperature, voltage, etc.
See also
*
Out-of-band management
In systems management, out-of-band management involves the use of management interfaces (or serial ports) for managing networking equipment. Out-of-band (''OOB'') management is a networking term which refers to accessing and managing network infras ...
*
Network Console on Acid
*
Power distribution unit
A power distribution unit (PDU) is a device fitted with multiple outputs designed to distribute electric power, especially to racks of computers and networking equipment located within a data center. Data centers face challenges in power protec ...
{{Portal, Electronics
External links
Netra-T1 AC200 LOM Usage
Computer buses
Out-of-band management
Sun Microsystems hardware