Promise Technology FastTrak SX4000 Lite User Manual download pdf (Page 49)

Chapter 5: Disk Array Concepts

RAID Level Performance

Fault

Tolerance

Capacity

No. of

Drives

RAID 0

(Striping)

Highest No

No. Drives x

Smallest Drive

2 to 4

RAID 1

(Mirroring)

Normal Yes Smallest Drive 2

RAID 0+1

(Stripe/Mirror)

High Yes 2X Smallest Drive 4

RAID 5

(Distributed

Parity)

High Yes

Smallest Drive x

No. Drives

– 1

3 or 4

JBOD

(Just a Bunch

of Disks)

Normal No Sum of all drives 1 to 4

About RAID Levels

Striping (RAID 0)

Reads and writes sectors of data interleaved between multiple drives. When any

disk member fails, it affects the entire array. Performance is better than a single

drive since the workload is balanced between the array members.

This array type is for high performance systems. Identical drives are

recommended for performance as well as data storage efficiency. The disk array

data capacity is equal to the number of drive members times the smallest

member capacity. For example, one 100 GB and three 120 GB drives will form a

400 GB (4 x 100 GB) disk array.

Stripe Size – A value can be set from 16KB to 256KB sector size. The size can

directly affect performance. In the FastBuild BIOS, the default is 64KB.

Disk Drives

Data

Stripe

Figure 14. RAID 0 writes data to both drives at the same time

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Promise Technology FastTrak SX4000 Lite User Manual Page 49

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