Areca ARC-1110 User Manual

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

entire array will fail if any one disk drive fails, due to a lack of 

redundancy.

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

drive is simultaneously written to another disk drive. Read per-

formance may be enhanced if the array controller can, in parallel, 

accesses 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.