RAID Types
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For best performance and space efficiency, you should use disks of the same brand and capacity when creating a RAID group.
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Increasing the number of disks in a RAID group increases the risk of simultaneous disk failure and lengthens rebuild times. When creating a storage pool with a large number of disks, you should split the disks into sub-groups using RAID 50 or RAID 60.
RAID Type |
Number of Disks |
Disk Failure Tolerance |
Overview |
---|---|---|---|
RAID 0 |
≥ 1 |
0 |
|
RAID 1 |
2 |
1 |
|
RAID 5 |
≥ 3 |
1 |
|
RAID 6 |
≥ 4 |
2 |
|
RAID 10 |
≥ 4 (Must be an even number) |
1 per pair of disks |
|
RAID 50 |
≥ 6 |
1 per disk subgroup |
|
RAID 60 |
≥ 8 |
2 per disk subgroup |
|
Triple Mirror |
3 |
2 |
|
RAID-TP |
≥ 5 |
3 |
|