Areca ARC-1110 ユーザーズマニュアル

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of data corruption is greatly reduced. The disadvantage is that write-

through operations are more time consuming.

All RAID arrays (with the exception of RAID 0, RAID 1 and RAID 1E) 

require parity to be calculated and written to the array in conjunction 

with data. Typically the parity is a simple XOR on the bytes compris-

ing a stripe. This is a computationally intensive operation that many 

modern RAID controllers perform using a dedicated ASIC (instead of 

calculating them in firmware on the main embedded processor’s core). 

This dedicated ASIC is often referred to as a XOR-engine.