ANSWER D
This table explains data distribution method for each RAID level.
It can help you to answer these type of questions in RAID :)
RAID 0
Striping
Data is distributed among all the disks as blocks, sectors, or some other unit.
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RAID 1
Mirroring
Duplicate all data in another set of disks
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RAID 2
Hamming Code
Strips are very small (single byte or word).
Error-correcting code is calculated for bits on data disk and stored in the corresponding bit positions on parity disks
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RAID 3
Bit-interleaved parity
A simple parity bit (not error correcting) is computed for all the bits in the same position on the data disks and stored in same bit position of parity disk
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RAID 4
Block-interleaved parity
Stripes are relatively large.
A parity strip is computed for all the strips in the same position on the data disks and stored in parity disk
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RAID 5
Block-interleaved
distributed parity
Distributes the parity strips across all disks.
Most versatile RAID level
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RAID 6
Block-interleaved dual distributed parity
Two different parity calculations are carried out
and stored in separate blocks on different disks.
P: EXOR and Q: Data check algorithm
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