Areca ARC-1110 User Manual

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RAID 5 is sometimes called striping with parity at byte level. In 

RAID 5, the parity information is written to all of the drives in the 

controllers rather than being concentrated on a dedicated parity 

disk. If one drive in the system fails, the parity information can 

be used to reconstruct the data from that drive. All drives in the 

array system can be used for seek operations at the same time, 

greatly increasing the performance of the RAID system. This 

relieves the write bottleneck that characterizes RAID 4, and is the 

primary reason that RAID 5 is more often implemented in RAID 

arrays.

the array. The parity data created during the exclusive-or is then 

written to the last drive in the array. If a single drive fails, data is 

still available by computing the exclusive-or of the contents cor-

responding strips of the surviving member disk. RAID 3 is best 

for applications that require very fast data- transfer rates or long 

data blocks.