Promise Technology FastTrak SX Series Version 4.4 Manuel d'utilisateur télécharger pdf (Page 87)

Appendix A: RAID Concepts

RAID is an acronym that stands for Redundant Array of Independent Disks. It is

divided into different numbered Levels. The numbers of these Levels do not

mean that one Level is higher or better than another. Each Level has its own

advantages and shortcomings.

PAM allows you to select the RAID Level when you create an Array. The

available RAID Level selection depends on which Promise product you have

and the number of disk drives available. The table below lists the options.

RAID Level Performance

Fault

Tolerance

Capacity

No. of

Drives

RAID 0

(Striping)

Highest No

No. Drives x

Smallest Size

2 to 4

RAID 1

(Mirroring)

Normal Yes

Smallest Size

Drive

RAID 0+1

(Stripe/Mirror)

High Yes

2X Smallest Size

Drive

RAID 5

(Distributed Parity)

High Yes No. Drives -1 3 or 4

JBOD

(Just a Bunch of

Disks)

Normal No Sum of all drives 1 to 4

Figure 82. RAID Levels obtainable with FastTrak SX4000 series and

S150 SX4.

1 2 ... 82 83 84 85 86 87 88 89 90 91 92 ... 101 102

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Promise Technology FastTrak SX Series Version 4.4 Manuel d'utilisateur Page 87