Raid 1 (adm) and raid 10 (adm) – HP Smart Storage Administrator User Manual

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Troubleshooting 111

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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).

When the array has more than three physical drives, drives are mirrored in trios, and the fault-tolerance

method is known as RAID 10 (ADM).