Gateway Ultra2 Manual de usuario descargar pdf (Pagina 60)

ADAC Ultra2 S466 Hardware Guide

Configuration Strategies

The most important factors in RAID array configuration

are: drive capacity, drive availability (fault tolerance), and

drive performance. You cannot configure a logical drive

that optimizes all three factors, but it is easy to choose a

logical drive configuration that maximizes one factor at the

expense of the other two factors, although needs are

seldom that simple.

Maximize Capacity RAID 0 achieves maximum drive capacity, but does

not provide data redundancy. Maximum drive capacity for

each RAID level is shown below. OEM level firmware that

can span up to 4 logical drives is assumed.

RAID

Level

Description Drives

Required

Capacity

0 Striping

without parity

1 – 32 (Number of disks) X capacity of

smallest disk

1 Mirroring 2 (Capacity of smallest disk) X (1)

3 Striping with

fixed parity

drive

3 – 8 (Number of disks) X (capacity of

smallest disk) - (capacity of 1 disk)

5 Striping with

floating parity

drive

3 – 8 (Number of disks) X (capacity of

smallest disk) - (capacity of 1 disk)

10 Mirroring and

Striping

4 – 8 (Must

be a multiple

of 2)

(Number of disks) X (capacity of

smallest disk) / (2)

30 RAID 3 and

Striping

6 – 32 (Must

be a multiple

of arrays)

(Number of disks) X (capacity of

smallest disk) – (capacity of 1 disk X

number of Arrays)

50 RAID 5 and

Striping

6 – 32 (Must

be a multiple

of arrays)

(Number of disks) X (capacity of

smallest disk) – (capacity of 1 disk X

number of Arrays)

Cont’d

1 2 ... 55 56 57 58 59 60 61 62 63 64 65 ... 111 112

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Gateway Ultra2 Manual de usuario Pagina 60

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