Hp Smart Array 6i Controller and 128MB BBWC Manuel d'utilisateur télécharger pdf (Page 43)

Drive Arrays and Fault-Tolerance Methods 43

RAID 0—No Fault Tolerance

A RAID 0 configuration provides data striping, but there is no protection against

data loss when a drive fails. However, it is useful for rapid storage of large

amounts of noncritical data (for printing or image editing, for example) or when

cost is the most important consideration.

Advantages:

• Has the highest write performance of all RAID methods.

• Has the lowest cost per unit of stored data of all RAID methods.

• All drive capacity is used to store data (none is needed for fault tolerance).

Disadvantages:

• All data on the logical drive is lost if a physical drive fails.

• Cannot use an online spare.

• Can only preserve data by backing it up to external drives.

RAID 1+0—Drive Mirroring

In a RAID 1+0 configuration, data is duplicated to a second drive.

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Hp Smart Array 6i Controller and 128MB BBWC Manuel d'utilisateur Page 43