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Then, create a logical drive within that array.
The data is striped across the drives, creating
blocks.
Notice that the stripe labeled
stripe and the stripe labeled
the preceding data stripe. Also notice that
each block on the mirror stripe is shifted one
drive.
With RAID level-1E, if one of the physical drives fails, the ServeRAID controller
switches read and write requests to the remaining functional drives in the RAID
level-1E array.
Understanding RAID level-5
RAID level-5 requires a minimum of three physical drives. This RAID level stripes
data and parity across all drives in the array. When you assign RAID level-5 to an
array, the capacity of the array is reduced by the capacity of one drive (for
data-parity storage).
RAID level-5 offers both data protection and increased throughput. RAID level-5
gives you higher capacity than RAID level-1, but RAID level-1 offers better
performance.
RAID level-5 requires a minimum of three drives and, depending upon the level of
firmware and the stripe-unit size, supports a maximum of 8 or 16 drives.
The following illustration is an example of a RAID level-5 logical drive.
Start with four physical drives.
1
*
.
is the data
**
3
..
is the copy of
*
4
6
**
Chapter 3. Understanding RAID technology
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3
1
2
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