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Appendix D: Understanding RAID ● 166
RAID 1 Enhanced Logical Drives
Note: RAID 1E is an upgrade feature; if the RAID 1E feature is locked,
see Adding Enhanced Features on page 21 for information on
purchasing a feature key.
A RAID 1 Enhanced (RAID 1E) logical drive is similar to a RAID 1
logical drive except that data is both mirrored and striped, and more
disk drives can be included. A RAID 1E logical drive can be built from
three or more disk drives—depending on the stripe size, the maximum
number of disk drives ranges from eight to sixteen.
In the example below, the large bold numbers represent the striped
data, and the smaller, non-bold numbers represent the mirrored data
stripes.
D
isk Drive 2
D
isk Drive 3
400 GB
400 GB
D
isk Drive 1 400 GB
Disk Drives in Logical Drive
Disk Drive 1
Disk Drive 2
Disk Drive 3
RAID 1E Logical Drive = 600 GB
3
2 6
5
2
1 5
4
1
3 4
6