Capacity on Demand (COD)

Capacity on Demand (COD) is an option that provides additional processing resources (CPUs) when you need them. These additional CPUs are provided on COD CPU/Memory boards that are installed in Sun Fire entry-level midrange systems. You can access the COD CPUs after you purchase the COD right-to-use (RTU) licenses for them.

environmental monitoring

All systems have a large number of sensors that monitor temperature, voltage, and current. The system controller polls devices in a timely manner and makes the environmental data available. The system controller shuts down various components to prevent damage.


Field-Replaceable Unit. A discrete part of the system, such as a power supply, a CPU/Memory board or a fan.


Lights Out Management.

LOM prompt

The LOM prompt provides configuration control, environmental status, the ability to power on and off the system, the ability to change the System Controller password and access to other system controller functions.

If POST, the Solaris Operating System, or the OpenBoot PROM is not running and only the system controller software is running, you can access the LOM prompt, which is lom>.

It also provides a location for console messages to be displayed.


Power-on self-test. This program that takes probes and tests the components of uninitialized system hardware, configures the components into a coherent initialized system, and hands it off to the OpenBoot PROM.

RTU license

Right-to-use license.


The software application that runs on the system controller and which provides a command-line interface for you to modify the system settings.


Serial Eraseable Programmable Read-Only Memory.

System Controller

The system controller is an embedded system resident on the IB_SSC assembly that connects to the system baseplane. The system controller is responsible for providing the Lights Out Management (LOM) functions which include power on sequencing, sequencing module power-on self-tests (POST), environmental monitoring, fault indication and alarms.

virtual time of day (TOD)

The TOD/NVRAM chip is located on the system controller board. The system controller multiplexes the physical TOD chip to provide TOD services.