Compaq StorageWorks 4000 - RAID Array Guia do Utilizador descarregar pdf (Página 148)

Hard Drive Arrays

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Data protection

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Performance enhancement

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Capacity changes

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Data reliability

The RA4000 Controller provides several options to produce data redundancy

for a more reliable system including distributing data, fault-tolerance methods,

assigning online spares, and rebuilding data.

During configuration, you will need to make RAID (Redundant Arrays of

Inexpensive Disks) level choices. RAID is a term used for an array technology

that provides data redundancy to increase system reliability and performance.

There are several RAID levels ranging from RAID 5 to RAID 0. The RA4000

Controller provides the following levels of RAID:

■ RAID 5 - distributed data guarding

■ RAID 4 - data guarding

■ RAID 1 - drive mirroring

■ RAID 0 - no fault tolerance (data striping only)

The fault-tolerance method you choose affects the amount of available disk

storage capacity and performance of your drive array. The following chart lists

the supported RAID levels and illustrates how the fault-tolerance method you

select affects the performance and capacity.

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Compaq StorageWorks 4000 - RAID Array Guia do Utilizador Página 148