Sun Microsystems Sun Fire X4200 - Manual (Page 189)

Glossary-17
random-access memory
(RAM) Volatile, semiconductor-based memory in which any byte of memory can be
accessed without touching the preceding bytes.
read-only file A file that a user cannot modify or delete.
read-only memory
(ROM) A nonvolatile memory chip on which data has been prerecorded. Once written
onto a ROM chip, data cannot be removed and can only be read.
real-time clock (RTC) A battery-backed component that maintains the time and date for a system,
even when the system is powered off.
reboot An operating system-level operation that performs a system shutdown
followed by a system boot. Power is a prerequisite.
Red Hat Package
Manager (RPM) A collection of tools developed by Red Hat, Inc. for Red Hat Linux that can
automate the install, uninstall, update, verify, and query software processes on
a computer. RPM is now commonly used by multiple Linux vendors.
redirection The channeling of input or output to a file or device rather than to the standard
input or output of a system. The result of redirection sends input or output
that a system would normally display to the display of another system.
redundant array of
independent disks
(RAID) A way of storing the same data at different places, thus redundantly, on
multiple hard disks. RAID enables a set of disk drives to appear as a single
logical disk drive to an application such as a database or file system. Different
RAID levels provide different capacity, performance, high availability, and cost
characteristics.
Remote Management
and Control Protocol
(RMCP) A networking protocol that enables an administrator to respond to an alert
remotely by powering the system on or off, or forcing a reboot.
remote procedure call
(RPC) A method of network programming that enables a client system to call
functions on a remote server. The client starts a procedure at the server and the
result is transmitted back to the client.
remote system A system other than the one on which the user is working.
reset A hardware-level operation that performs a system power off, followed by a
system power on.
root In UNIX operating systems, the name of the superuser (root). The root user has
permissions to access any file and carry out other operations not permitted to
ordinary users. Roughly equivalent to the Administrator user name on
Windows Server operating systems.