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Using IBM ServeRAID 121
level-1, the data is mirrored, and the capacity of the logical drive is 50% of the array
capacity of the grouping of physical drives in the array.
RAID level-1E requires a minimum of three drives and, depending upon the level of
firmware and the stripe-unit size, supports a maximum of eight or 16 drives.
The following illustration is an example of an Enhanced RAID level-1 logical drive.
You start with three physical drives.
Create an array using the physical drives.
Then, create a logical drive within that array.
The data is striped across the drives, creating blocks. Notice that the stripe labeled ★
is the data stripe and the stripe labeled ★ ★ is the mirror (that is, the copy) of the
preceding data stripe. Also notice that each block on the mirror stripe is shifted one
drive.
1 2 3
3 1 2
4 5 6
6 4 5
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