Raid 1 (Adm) And Raid 10 (Adm) - HP Configuring Arrays Reference Manual

Advantages:
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This method has the second highest read performance of any fault-tolerant configuration.
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No data is lost when a drive fails, as long as no failed drive is mirrored to another failed drive.
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Up to half of the physical drives in the array can fail.
Disadvantages:
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This method is expensive, because many drives are needed for fault tolerance.
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Only half of the total drive capacity is usable for data storage.

RAID 1 (ADM) and RAID 10 (ADM)

In RAID 1 (ADM) and RAID 10 (ADM) configurations, data is duplicated to two additional drives.
When the array contains only three physical drives, the fault-tolerance method is known as RAID 1 (ADM).
Drive arrays and fault-tolerance methods 115