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86 Glossary
R
RAID
Acronym for Redundant volume of Independent Disks (originally Redundant
volume of Inexpensive Disks). It is an volume of multiple independent physical
disks managed together to yield higher reliability and/or performance exceeding
that of a single physical disk. The virtual disk appears to the operating system as
a single storage unit. I/O is expedited because several disks can be accessed
simultaneously. Redundant RAID levels provide data protection.
ROM
Read-only memory (ROM), also known as firmware, is an integrated circuit
programmed with specific data when it is manufactured. ROM chips are used
not only in computers, but in most other electronic items as well. Data stored in
these chips is nonvolatile i.e., it is not lost when the power is turned off.
Data stored in these chips is either unchangeable or requires a special operation
such as flashing to change.
RPM
RPM, short for "Red Hat Package Manager" is a package management system
primarily intended for Linux. RPM installs, updates, uninstalls, verifies and
queries software. RPM is the baseline package format of the Linux Standard
Base. Originally developed by Red Hat for Red Hat Linux, RPM is now used by
many Linux distributions. It has also been ported to some other operating
systems such as NetWare by Novell.
S
SAS
Serial-Attached SCSI, SAS, is a serial, point-to-point, enterprise-level device
interface that leverages the proven SCSI protocol set. The SAS interface
provides improved performance, simplified cabling, smaller connectors, lower
pin count, and lower power requirements when compared to parallel SCSI.
PERC H200.book Page 86 Tuesday, July 13, 2010 4:15 PM