Hp StorageWorks 1500cs Modular Smart Array Manuel d'utilisateur télécharger pdf (Page 63)

Drive arrays and fault-tolerance methods 63

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RAID 1+0—Drive Mirroring

• RAID 5—Distributed Data Guarding

• RAID 6 (ADG)—Advanced Data Guarding

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.

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Hp StorageWorks 1500cs Modular Smart Array Manuel d'utilisateur Page 63