RAID Features
Figure 5-6. Data Map of a RAID 10 Volume with 5 Disks, Showing the First 4 Stripes Using Double Mirroring - Striping with Mirroring with Four Disks
Disk #0 | Disk #1 | Disk #2 | Disk #3 | Disk #4 |
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| Vol 1 |
D7 | D8 | D8 | D9 | D9 | Vol 0 |
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D5 | D5 | D6 | D6 | D7 |
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D2 | D3 | D3 | D4 | D4 |
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D0 | D0 | D1 | D1 | D2 |
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Data Map of a RAID Level 10 Volume
Di is the i'th data strip
5.2.9.5RAID Level 5 Example
Data and parity on a RAID 5 volume are striped across all of its members. If one of its member disks fails, then a RAID 5 volume does not lose data and continues to run in degraded mode. When a failing disk is replaced, data and parity is reconstructed onto the replacement disk automatically while the volume continues to operate. Parity calculates the data in two drives and stores the result on a third drive (a bit from drive 1 is XOR'd with a bit from drive 2, and the resultant bit is stored on drive 3). This provides a balance between performance and cost.Parity calculates the data in two drives and stores the result on a third drive (a bit from drive 1 is XOR'd with a bit from drive 2, and the resultant bit is stored on drive 3). This provides a balance between performance and cost.
Figure 5-7. Data Map of a Raid 5 Volume with 4 Disks, Showing the First 5 Stripes
Disk #0 | Disk #1 | Disk #2 | Disk #3 |
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| Vol 1 |
D12 | D13 | D14 | P4 | Vol 0 |
P3 | D9 | D10 | D11 | |
D6 | P2 | D7 | D8 |
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D3 | D4 | P1 | D5 |
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D0 | D1 | D2 | P0 |
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Data Map of a RAID Level 5 Volume
Di is the i'th data strip
Pi is the parity strip for the i'th stripe
Intel® Server RAID Controller |
