Hp Smart Array 6i Controller and 128MB BBWC Manuel d'utilisateur télécharger pdf (Page 48)

48 HP Smart Array 6i Controller User Guide

Item RAID 0 RAID 1+0 RAID 5 RAID ADG

Relative cost Low High Medium Medium

*NOTE: Values for usable drive space are calculated with these

assumptions: (1) all physical drives in the array have the same capacity;

(2) online spares are not used; (3) no more than 14 physical drives are

used per array for RAID 5; and (4) no more than 56 drives are used with

RAID ADG.

Selecting a RAID Method

NOTE: Not all controllers support RAID ADG.

Most Important Criterion Also Important Suggested RAID Level

Fault tolerance Cost effectiveness

I/O performance

RAID ADG*

RAID 1+0

Cost effectiveness Fault tolerance

I/O performance

RAID ADG*

RAID 5 (RAID 0 if fault tolerance is not required)

I/O performance Cost effectiveness

Fault tolerance

RAID 5 (RAID 0 if fault tolerance is not required)

RAID 1+0

Alternative Fault-Tolerance Methods

Your operating system may also support software-based RAID or controller

duplexing.

• Software-based RAID resembles hardware-based RAID, except that the

operating system works with logical drives as if they were physical drives.

To protect against data loss caused by physical drive failure, each logical

drive must be in a different array from the others.

• Controller duplexing uses two identical controllers with independent,

identical sets of drives containing identical data. In the unlikely event of a

controller failure, the remaining controller and drives will service all

requests.

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Hp Smart Array 6i Controller and 128MB BBWC Manuel d'utilisateur Page 48