Hp StorageWorks 1510i Modular Smart Array Manual do Utilizador descarregar pdf (Página 90)

Table 7 Summary of RAID methods

RAID 0 RAID 1+0

RAID 5 RAID 6

Alternative name

Striping Mirroring

Distributed Da

Guarding (DDG)

Advanced Data

Guarding (ADG)

Usable drive

space*

100% 50% 67% to 93% 50% to 96%

Usable drive space

formula

n/2 (n-1)/n (n-2)/n

Minimum number

of physical drives

Tolerates physical

drive failure?

Yes Yes Yes

Tolerates

simultaneous failure

of more than one

physical drive?

Only if no two

failed drives are in

a mirrored pair

Yes

Read performance

High High High High

Write performance

High Medium

Low Low

Relative cost

Low

High Medium Medium

*Values f

orusabledrivespacearecalculatedwiththeseassumptions:

• All physi

cal drives in the array have the same capacity.

• Online sp

ares are not used.

• No more t

han14physicaldrivesareusedperarrayforRAID5.

• No more t

han 56 drives are used with RAID 6.

Choosing a RAID level

Use Table 8 to help you determine the best RAID level for your environment.

Table 8 Choosing a RAID level

Most important characteristic Also important Suggested RAID level

Fault tolerance

Cost effectiveness

RAID 6

I/O performance

RAID 1+0

Cost effectiveness

Fault tolerance

RAID 6*

I/O performance

RAID5(RAID0iffaulttolerance

is not required)

I/O performance Cost effectiveness

RAID5(RAID0iffaulttolerance

is not required)

Fault

tolerance

RAID 1+0

90 Storage overview

1 2 ... 85 86 87 88 89 90 91 92 93 94 95 ... 98 99

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