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RAID 10
A RAID 10 array uses four hard drives to create a combination of RAID levels 0 and 1 by forming a RAID 0 array from two RAID 1 arrays.
Since all of the data on the RAID 0 array is duplicated, the capacity of a RAID 10 array is the size of the RAID 0 array. For example, four 400 GB hard drives in a RAID 10 array will appear as a single 800 GB hard drive to the operating system.
The primary benefit of RAID 10 is that it combines the benefits of RAID 0 performance and RAID 1 fault-tolerance. It provides good data reliability in the case of a single drive failure. When one hard drive fails, all data is immediately available from the other half of the mirror without any impact to the data integrity. In the case of a disk failure, the computer system will remain fully operational to ensure maximum productivity. Data fault-tolerance can be restored by replacing the failed drive.
The performance of a RAID 10 array is greater than that of a single drive since data can be read from multiple disks simultaneously. Compared to a two-disk RAID 0, RAID 10 read performance is higher as data can be read from either half of the mirror, but write performance is slightly lower due to ensuring data is written out completely to the array.
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Minimum Disks:
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4 |
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Advantage:
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Combines the read performance of RAID 0 with the fault-tolerance of RAID 1. |
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Fault-tolerance:
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Excellent - disk mirroring means that all data on one disk is duplicated on another disk. |
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Application:
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High-performance applications requiring data protection, such as video editing. |
This applies to:
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