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LearnStep 1 of 2
RAID
Learning Objectives
- •Understand RAID concepts
- •Compare RAID levels
Lesson Outline
LearnStep 1/2
RAID
Capacity: N disks, Fault tolerance: None
RAID 1 - Mirroring
Capacity: N/2 disks, Fault tolerance: 1 disk
RAID 5 - Striping with Distributed Parity
Capacity: N-1 disks, Fault tolerance: 1 disk
RAID 6 - Double Parity
Like RAID 5 but with 2 parity blocks. Tolerates 2 disk failures.
RAID 10 (1+0) - Mirrored Stripes
Best performance + redundancy
Comparison
| RAID | Min Disks | Capacity | Fault Tolerance |
|---|---|---|---|
| 0 | 2 | 100% | None |
| 1 | 2 | 50% | 1 disk |
| 5 | 3 | (N-1)/N | 1 disk |
| 6 | 4 | (N-2)/N | 2 disks |
| 10 | 4 | 50% | 1 per mirror |