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124 Hardware Maintenance Manual: xSeries 250
Create an array using all four physical drives.
Then, create a logical drive (labeled as 1) within the array. Notice that the distributed
spare drive is the free space (labeled as 2) below the logical drive.
The data is striped across the drives, creating blocks in the logical drive. The storage
of the data parity (denoted by
★
) is striped, and it shifts from drive to drive as it does
in RAID level-5. Notice that the spare drive is not striped.
If a physical drive fails in the array, the data from the failed drive is compressed into
the distributed spare drive. The logical drive remains RAID level-5E. When you
replace the failed drive, the data for the logical drive decompresses and returns to the
original striping scheme.
x
x
x
1
2
x
x
*
*
7 8 9
*
1 2 3
4 5 6