Dell PowerEdge 1750 Ser'in El Kitabı - Sayfa 28

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Sayfayı Yazdır

PS/2

Abbreviation for Personal System/2.

PXE

Acronym for Preboot Execution Environment.

RAC

Acronym for remote access controller.

RAID

Acronym for redundant array of independent disks. An array of multiple independent hard drives that, in varying levels, provide high performance and fault

tolerance.

The following RAID levels provide various mixes of performance, reliability, and cost: Level 0 (striping), Level 1 (mirroring), Level 5 (striping with parity), Level

10 (striping with mirroring) and Level 50 (linked Level 5 arrays).

RAID 0

RAID 0 is commonly called striping. This was not originally defined as a RAID level but has since come into popular use. In this array configuration, data is

written sequentially across the available disks and no redundancy is provided. RAID 0 configurations provide very high performance but relatively low

reliability. RAID 0 is the best choice when controller cards are duplexed. See striping.

RAID 1

RAID 1 is commonly called mirroring. RAID 1 also uses striping, so RAID 1 may be regarded as the mirroring of RAID 0 configurations. RAID 1 is the best choice

in high-availability applications that require high performance or relatively low data capacity. See mirroring, RAID 10, and striping.

RAID 3

RAID 3 is commonly called guarding. It uses data striping, like RAID 0, but adds a single, dedicated parity drive for redundancy and block-level parallel access.

The parity data stored on this drive can be used to recover data lost from a single failed drive, and the generation of the parity data frequently requires

reading data from multiple physical drives. RAID 3 is generally used in situations that require large sequential I/Os and a high data-transfer rate, such as video

streaming. See guarding and striping.

RAID 4

RAID 4 is commonly called guarding. It uses a single, dedicated parity drive, like RAID 3, but requires reading and writing large blocks of data to one physical

drive at a time. See guarding and striping.

RAID 5

RAID 5 is commonly called guarding. RAID 5 is identical to RAID 4, except that the parity data is distributed evenly across all physical drives instead of a parity

drive. In configurations using a large number of physical drives in which a large number of simultaneous small write operations are being performed, RAID 5

offers potentially higher performance than RAID 4. RAID 4 and RAID 5 configurations are appropriate in high-availability applications where performance is less

critical or where high data capacity is required. See guarding.

RAID 10 (RAID 1+0)

RAID 10 is commonly called RAID 1+0. RAID 10 is a multilevel array that combines mirrored drives (RAID 1) with data striping (RAID 0). In a RAID 10

configuration, data is mirrored on two drives and then striped across two or more sets of mirrored drives. RAID 10 offers the data transfer advantages of

striped arrays and the accessibility features of mirrored arrays. System performance during a drive rebuild is also better than parity-based arrays, since data

does not need to be regenerated from parity information, but simply copied from a surviving drive.

RAID 50

Two or more linked RAID 5 arrays. For example, a RAID 5 array that is implemented with three drives and then continues on with three more array drives

would be a RAID 50 array. RAID 50 provides data redundancy through parity. See parity.

RAM

Acronym for random-access memory. The system's primary temporary storage area for program instructions and data. Each location in RAM is identified by a

number called a memory address. Any information stored in RAM is lost when you turn off your system.

RAS

Abbreviation for Remote Access Service. This service allows users running the Windows operating system to remotely access a network from their system

using a modem.

read-only file

A read-only file is one that you are prohibited from editing or deleting. A file can have read-only status if:

Its read-only attribute is enabled.

It resides on a physically write-protected diskette or on a diskette in a write-protected drive.

It is located on a network in a directory to which the system administrator has assigned read-only rights to you.

readme file

A text file included with a software package or hardware product that contains information supplementing or updating the documentation for the software or