Compatibility Guide

Glossary 187
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 revolutions per minute.
RPM
Abbreviation for Red Hat
®
Package Manager.
RTC
Abbreviation for real-time clock. Battery-powered clock circuitry inside the system
that keeps the date and time after you turn off the system.
SAN
Acronym for storage area network.
SAS
Acronym for Secure Authentication Services or Serial-attached SCSI. When
referring to security protocols or authentication, SAS is Secure Authentication
Services. When referring to computer peripheral devices that employ a serial
(one bit at a time) means of digital data transfer over thin cables, SAS is
Serial-attached SCSI.
SCA
Abbreviation for single connector attachment.
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.