HP ProLiant DL280 Configuring Arrays on HP Smart Array Controllers Reference G - Page 107
Raid 1 (adm) And Raid 10 (adm
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Advantages: • This method has the second highest read performance of any fault-tolerant configuration. • No data is lost when a drive fails, as long as no failed drive is mirrored to another failed drive. • Up to half of the physical drives in the array can fail. Disadvantages: • This method is expensive, because many drives are needed for fault tolerance. • 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 107
Drive arrays and fault-tolerance methods
107
Advantages:
•
This method has the second highest read performance of any fault-tolerant configuration.
•
No data is lost when a drive fails, as long as no failed drive is mirrored to another failed drive.
•
Up to half of the physical drives in the array can fail.
Disadvantages:
•
This method is expensive, because many drives are needed for fault tolerance.
•
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).