Areca ARC-1280ML Manual do Utilizador descarregar pdf (Página 174)

APPENDIX

174

• RAID 0

RAID 0, also referred to as striping, writes stripes of data across

multiple disk drives instead of just one disk drive. RAID 0 does

not provide any data redundancy, but does offer the best high-

speed data throughput. RAID 0 breaks up data into smaller blocks

and then writes a block to each drive in the array. Disk strip-

ing enhances performance because multiple drives are accessed

simultaneously; the reliability of RAID level 0 is less because the

entire array will fail if any one disk drive fails.

• RAID 1

RAID 1 is also known as “disk mirroring”; data written on one

disk drive is simultaneously written to another disk drive. Read

performance will be enhanced if the array controller can, in paral-

lel, access both members of a mirrored pair. During writes, there

will be a minor performance penalty when compared to writing

to a single disk. If one drive fails, all data (and software applica-

tions) are preserved on the other drive. RAID 1 offers extremely

high data reliability, but at the cost of doubling the required data

storage capacity.

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