Compare RAID levels according to their capabilities.
The following information provides data redundancy, usable disk
capacity, read performance, and write performance for each RAID level.
Table 1. RAID level summary| RAID level |
Data redundancy |
Usable disk capacity |
Read performance |
Write performance |
Min/Max devices per array |
|---|
| RAID 0 |
None |
100% |
Very good |
Excellent |
1/18 |
| RAID 5 |
Very good |
67% to 94% |
Very good |
Good |
3/18 |
| RAID 6 |
Excellent |
50% to 89% |
Very good |
Fair to good |
4/18 |
| RAID 10 |
Excellent |
50% |
Excellent |
Very good |
2/18 (even numbers only) |
- RAID 0
- Does not support data redundancy, but provides a potentially higher
I/O rate.
- RAID 5
- Creates array parity information so that the data can be reconstructed
if a disk in the array fails. Provides better capacity than RAID level
10 but possibly lower performance.
- RAID 6
- Creates array "P" and "Q" parity information so that the data
can be reconstructed if one or two disks in the array fail. Provides
better data redundancy than RAID 5 but with slightly lower capacity
and possibly lower performance. Provides better capacity than RAID
level 10 but possibly lower performance.
- RAID 10
- Stores data redundantly on mirrored pairs to provide maximum protection
against disk failures. Provides generally better performance than
RAID 5 or 6, but has lower capacity.
Note: A two-drive RAID level
10 array is equivalent to RAID level 1.
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