Sun Microsystems X4150 manual Programmable read- only memory

programmable read- only memory

(PROM) A memory chip on which data can be programmed only once and which retains the program forever. PROMs retain data even when power is off.

protocol A set of rules that describes how systems or devices on a network exchange information.

proxy A mechanism whereby one system acts on behalf of another system in responding to protocol requests.

public key encryption A cryptographic method that uses a two-part key (code) that is made up of public and private components. To encrypt messages, the published public keys of the recipients are used. To decrypt messages, the recipients use their unpublished private keys, which are known only to them. Knowing the public key does not enable users to deduce the corresponding private key.

R

rack unit (U)

random access memory (RAM)

read-only file

read-only memory (ROM)

real-time clock (RTC)

reboot

Red Hat Package

Manager (RPM)

A measure of vertical rack space equal to 1.75 inches (4.45 cm).

Volatile, semiconductor-based memory in which any byte of memory can be accessed without touching the preceding bytes.

A file that a user cannot modify or delete.

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.

A battery-backed component that maintains the time and date for a system, even when the system is powered off.

An operating system–level operation that performs a system shutdown followed by a system boot. Power is a prerequisite.

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 many 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.

124 Sun Fire X4150 Server Embedded Lights Out Manager Administration Guide • September 2007