eXtended System Control facility unit
(XSCFU) The XSCF board for this server which contains system administration function and operates with independent processor.
(FRU) A part that can be replaced by field engineers when servicing the system.
firmware Firmware is the software to control the system. These servers have the following firmware; OpenBoot PROM, POST, XSCF. For details, see the definition of OpenBoot PROM, POST, XSCF in this glossary. SAS controller, GbE controller and control program for IOBOX may be considered as firmware.
Hardware Control
Program (HCP) A date file which contains cluster of XSCF, POST, and OpenBoot PROM firmware settings.
I/O unit (IOU) The unit of physical print board and mechanical components, consists of I/O controller. The combination/segmentation of CMU and IOU configures the system (domain).
logical system board
(LSB) A logical unit name of an XSB to which a logical number (LSB number) is assigned. LSB is used together with LSB number when domains are constructed and it is referred to by Solaris OS.
motherboard unit
(MBU) The main board assembly to which other boards and components are connected in the servers with a single XSCF Unit. The servers with redundant XSCF Units do not have motherboard unit, but CMUs.
OpenBoot PROM A layer of software that does the following: takes control of the configured this system from the
physical system board
(PSB) The PSB is made up of physical components, and can include 1 CMU and 1 IOU or just 1 CMU. In midrange servers, the CMU is mounted on MBU. A PSB can also be used as to describe a physical unit for addition/deletion/exchange of hardware. The PSB can be used in one of two methods, one complete unit (undivided status) or divided into four subunits.
(POST) A program that takes uninitialized this system hardware, probes and tests its components, configures the working components into a coherent initialized system, and transfers control to the OpenBoot PROM.