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Backed-out writes Backed-out writes
After parity initialization is complete, random writes to a RAID 5, 50, 6, or 60 can use a faster backed-out write operation. A backed-out
write uses the existing parity to calculate the new parity data. As a result, the write penalty for RAID 5 and RAID 50 is always four drive
operations, and the write penalty for a RAID 6 and RAID 60 is always six drive operations. As you can see, the write penalty is not
influenced by the number of drives in the array.
Backed-out writes is also known as "read-modify-write."
This method has the benefit of faster RAID, 5, 50, 6, or 60 random writes.
Backed-out writes 43