R

RAID(Redundant Array of Inexpensive [or Independent] Disks)

A set of industry standards that defines storage solutions involving more than one hard disk.

RAID 0

Also known as disk striping, data in a RAID 0 volume is written evenly among hard disks (or slices), resulting in a data "stripe." Solaris also supports a disk concatenation version of RAID 0. RAID 0 does not provide any fault tolerance.

RAID 1

Also known as disk mirroring, RAID 1 volumes duplicate file systems (or entire hard disks) onto one or more additional hard disks. RAID 1 provides fault tolerance.

RAID 5

Also known as disk striping with parity, RAID 5 volumes write data across several hard disks (or slices) like a RAID 0 volume, but also write a parity block for fault tolerance.

reallocation

Also called auto-layout, reallocation is a feature of suninstall, Web Start, and custom JumpStart that automatically reallocates disk space during an upgrade (if the space is available) to accommodate the new version of Solaris.

receptacle

The location on the computer that is configured to accept a hot pluggable device.

relative pathname

The location of a file or directory, based on your current working directory.

Remote Procedure Call (RPC)

A protocol used to start processes on remote computers.

resolver

A client computer configured to use the DNS naming service. A resolver is also another name for a DNS client configuration file, /etc/resolv.conf.

response file

Used during an interactive installation, a response file provides answers to questions that software packages ask during the installation process. A response file allows for installations to complete without human intervention.

restore

To copy files from a tape backup (or other backup media) onto a hard disk for use.

resynchronization region

In a mirrored volume, the area of a submirror that needs to be resynchronized.

Reverse Address Resolution Protocol (RARP)

The protocol used by a boot server to pass the IP address back to the client during the boot process.

rights profile

A collection of authorizations and privileged applications.

role

A specialized user account that is often granted limited or full administrative abilities. A role can be accessed only by using the su command.

role-based access control

A standard that enables an administrator to assign certain administrative tasks to specific users or roles, without giving the user full administrative privileges.

router

A network connectivity device that connects local and wide area networks to each other. Routers direct network traffic based on a logical network address (an IP address) and are the backbone of the Internet.

rules file

A text file that contains one or more descriptive characteristics about a client computer, matched with a custom JumpStart profile name. A client computer that matches the listed characteristic(s) will use the specified profile.

run control (rc) scripts

Small scripts that execute other scripts in order to complete the initialization of the operating system.

run level

A designation that defines the operation of Solaris, including which resources and services are available to users. Solaris has eight run levels, although only seven are currently used. Also called an init state.