Msi X2-109 v1 User Manual download pdf (Page 24)

1-8 Overview

RAID 5 addresses the bottleneck issue for random I/O operations.

Because each drive contains both data and parity, numerous writes can

take place concurrently.

Figure 1.3 shows a RAID 5 array with six disk drives.

Figure 1.3 RAID 5 Array

Uses

Provides high data throughput. Use RAID 5 for transaction

processing applications because each drive can read and

write independently. If a drive fails, the RAID controller uses

the parity drive to recreate all missing information. Use also for

office automation and online customer service that requires

fault tolerance. Use for any application that has high read

request rates but low write request rates.

Strong Points

Provides data redundancy, high read rates, and good

performance in most environments. Provides redundancy with

lowest loss of capacity.

Weak Points

Not well suited to tasks requiring lot of small writes. Suffers

more impact if no drive cache is used (clustering). Disk drive

performance will be reduced if a drive is being rebuilt or a

background initialization is in progress. Environments with few

processes do not perform as well because the RAID overhead

is not offset by the performance gains in handling

simultaneous processes.

Drives

Three to eight

Segment 1

Segment 7

Segment 2

Segment 8

Segment 3

Segment 9

Segment 4

Segment 10

Segment 5

Parity (6-10)

Parity (11–15)

Parity (1-5)

Segment 6

Note: Parity is distributed across all drives in the array.

Segment 12

Segment 15

Segment 11

Segment 14

Segment 13

Segment 19

Segment 25

Segment 20

Segment 23

Segment 18

Segment 21

Segment 16

Segment 22

Segment 17

Parity (21-25)

Parity (26–30)

Parity (16-20)

Segment 24

Segment 30

Segment 27 Segment 29

Segment 26

Segment 28

1 2 ... 19 20 21 22 23 24 25 26 27 28 29 ... 131 132

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