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INTRODUCTION
1 | Also known as mirroring | 2 | Lower | Reads | Reads are |
| All data replicated on N sepa- |
| than | are | twice as fast |
| rated disks. |
| RAID 6; | higher | as a single |
| N is almost always 2. |
| Higher | than a | disk; |
| This is a high availability solu- |
| than | single |
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| tion, but due to the 100% |
| RAID | disk; | Write are |
| duplication, it is also a costly |
| 3, 5 |
| similar to a |
| solution. Half of drive capacity in |
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| Writes | single disk. |
| array devoted to mirroring. |
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| similar |
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| to a |
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| single |
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1E | Also known | 3 | Lower | Transfer | Reads are |
| Parity. |
| than | rates | twice as fast |
| Data and parity information |
| RAID 6; | more | as a single |
| is subdivided and distributed |
| Higher | similar | disk; |
| across all disks. Parity must be |
| than | to RAID |
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| the equal to the smallest disk |
| RAID | 1 than | Writes are |
| capacity in the array. Parity |
| 3, 5 | RAID 0 | similar to a |
| information normally stored on a |
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| single disk. |
| dedicated parity disk. |
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3 | Also known | 3 | Lower | Reads | Reads are |
| ity. |
| than | are | close to being |
| Data and parity information |
| RAID 1, | similar | twice as fast |
| is subdivided and distributed |
| 1E, 6; | to | as a single |
| across all disks. Parity data |
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| RAID | disk; |
| consumes the capacity of 1 |
| Higher | 0; |
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| disk drive. Parity information |
| than a |
| Writes are |
| normally stored on a dedicated |
| single | Writes | similar to a |
| parity disk. |
| drive | are | single disk. |
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| slower |
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| than a |
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| single |
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5 | Also known | 3 | Lower | Reads | Reads are |
| Distributed Parity. |
| than | are | similar to |
| Data and parity information |
| RAID 1, | similar | RAID 0; |
| is subdivided and distributed |
| 1E, 6; | to |
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| across all disk. Parity data con- |
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| RAID 0; | Writes are |
| sumes the capacity of 2 disk |
| Higher |
| slower than a |
| drive. |
| than a | Writes | single disk. |
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| single | are |
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| drive | slower |
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| than a |
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| single |
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