Users Guide

106 Glossary
as Microsoft Windows or Red Hat
®
Enterprise Linux,
is installed.
program diskette set
The set of diskettes from which you can perform a
complete installation of an operating system or
application program. When you reconfigure a program,
you often need its program diskette set.
PXE
Abbreviation for Pre-boot eXecution Environment.
RAC
Acronym for remote access controller.
RAID
Acronym for redundant array of independent drives.
RAM
Acronym for random-access memory. A system's
primary temporary storage area for program
instructions and data. Each location in RAM is
identified by a number called a memory address. Any
information stored in RAM is lost when you turn off
your system.
RAM disk
A memory-resident program that emulates a hard
drive.
read-only file
A read-only file is one that you are prohibited from
editing or deleting. A file can have read-only status if:
• Its read-only attribute is enabled.
• It resides on a physically write-protected diskette or
on a diskette in a write-protected drive.
• It is located on a network in a directory to which the
system administrator has assigned read-only
rights to you.
readme file
A text file included with a software package or hardware
product that contains information supplementing or
updating the documentation for the software or
hardware. Typically, readme files provide installation
information, describe new product enhancements or
corrections that have not yet been documented, and
list known problems or other things you need to be
aware of as you use the software or hardware.
ROM
Acronym for read-only memory. Your system contains
some programs essential to its operation in ROM code.
Unlike RAM, a ROM chip retains its contents even
after you turn off your system. Examples of code in
ROM include the program that initiates your system's
boot routine and the POST.
RPM
Abbreviation for Red Hat Package Manager.
schema
A collection of class definitions that describes managed
objects in a particular environment. A CIM schema is
a collection of class definitions used to represent
managed objects that are common to every
management environment, which is why CIM is called
the Common Information Model.
SCSI
Acronym for small computer system interface. An I/O
bus interface with faster data transmission rates than
standard ports. You can connect up to seven devices
(15 for some newer SCSI types) to one SCSI interface.
server module
A modular system component that functions as an
individual system. To function as a system, a server
module is inserted into a chassis which includes power
supplies, fans, a system management module, and at
least one network switch module. The power supplies,
fans, system management module, and network switch
module are shared resources of the server modules in
the chassis. See modular system.
service tag number
A bar code label that identifies each system in the event
that you need to call for customer or technical support.