Promise Technology FastTrak SX4000 Lite Manuel d'utilisateur télécharger pdf (Page 48)

FastTrak S150 SX4 / SX4000 / SX4000 Lite User Manual

Disk Array Terms

Disk Array Description

A disk array is formed from a group of two or more disk drives that appear to the

system as a single drive. The advantage of an array is to provide better

throughput performance and/or data fault tolerance.

Better performance is accomplished by sharing the workload among multiple

physical drives.

Fault tolerance is achieved through data redundancy operation where if one (or

more) drive fails or has a sector failure, a mirrored copy of the data can be found

on another drive(s).

For optimal results, select identical Serial ATA drives (S150 SX4) or Ultra ATA

drives (SX4000 / SX4000 Lite) to install in disk arrays. The drives’ matched

performance allows the array to function better as a single drive.

Disk Array Member

The individual disk drives in an array are called members. Each member of a

specific disk array has coded in its reserved sector configuration information that

identifies the drive as a member. All disk members in a formed disk array are

recognized as a single physical drive to the system.

Disk Array Types

For most installations, the FastBuild setup Auto Setup (1) option will configure

your system.

There are four disk array types in three categories that can be installed on the

FastTrak S150 SX4 or SX4000 / SX4000 Lite card. Striping is in the

Performance category while Mirroring, Striping/Mirroring are in the Fault

Tolerance category.

Disk arrays within the Performance and Fault Tolerance categories conform to

the Redundant Array of Independent Disks technology, or RAID. The RAID

levels supported are 0, 1, 0+1 and 5.

FastBuild also supports “Just a Bunch of Disks” (JBOD) technology. With a

FastTrak S150 SX4 or SX4000 / SX4000 Lite card, JBOD allows you to add up

to four disk drives to your computer for expanded storage capacity. However,

unlike RAID, JBOD drives function individually, thus there is no performance

increase nor any fault tolerance.

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Promise Technology FastTrak SX4000 Lite Manuel d'utilisateur Page 48