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APPENDIX
Summary of RAID Levels
RAID subsystem supports RAID Level 0, 1, 10, 3, 5, 6, 30, 50 and 60.
The following 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 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
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