APPENDIX
161
Summary of RAID Levels
RAID controller supports RAID Level 0, 1, 10(1E), 3, 5, and 6. The fol-
lowing table provides a summary of RAID levels.
Features and Performance
RAID
Level
Description
Min. Disks
requirement
Data
Reliability
0
Also known as stripping
Data distributed across multiple drives
in the array. There is no data protec-
tion.
1
No data
Protection
1
Also known as mirroring
All data replicated on N Separated
disks.
N is almost always 2.
This is a high availability Solution, but
due to the 100% duplication, it is also
a costly solution.
2
Single-disk failure
10(1E) Also known Block-Interleaved Parity.
Data and parity information is sub-
divided and distributed across all
disks. Parity must be the equal to the
smallest disk capacity in the array.
Parity information normally stored on
a dedicated parity disk.
3
Single-disk failure
3
Also known Bit-Interleaved Parity.
Data and parity information is sub-
divided and distributed across all
disk. Parity must be the equal to the
smallest disk capacity in the array.
Parity information normally stored on
a dedicated parity disk.
3
single-disk failure
5
Also known Block-Interleaved Distrib-
uted Parity.
Data and parity information is sub-
divided and distributed across all
disk. Parity must be the equal to the
smallest disk capacity in the array.
Parity information normally stored on
a dedicated parity disk.
3
single-disk failure
6
As RAID level 5, but with additional
independently computed redundant
information
4
Two-disk failure
