User's Manual

52
RAID 5 (layout) parity-algorithm
It is possible to set one of four algorithms of placement data blocks and parity
blocks in matrix. Our default option is left-symmetric, which is the best for large
reads. Other recommended value is left-asymmetric.
Left-Asymmetric Algorithm
Unit
S0
Unit
S1
Unit
S2
Unit
S3
0 1 2 Parity
3 4 Parity 5
6 Parity 7 8
Parity 9 10 11
12 13 14 Parity
Left-Symmetric Algorithm
Unit
S0
Unit
S1
Unit
S2
Unit
S3
0 1 2 Parity
4 5 Parity 3
8 Parity 6 7
Parity 9 10 11
12 13 14 Parity
Right-Asymmetric Algorithm
Unit
S0
Unit
S1
Unit
S2
Unit
S3
Parity 0 1 2
3 Parity 4 5
6 7 Parity 8
9 10 11 Parity
Parity 12 13 14
Right-Symmetric Algorithm
Unit
S0
Unit
S1
Unit
S2
Unit
S3
Parity 0 1 2
5 Parity 3 4
7 8 Parity 6
9 10 11 Parity
Parity 12 13 14
RAID 6 (layout) parity-algorithm
It is possible to set one from four algorithms of placement data blocks and parity
blocks in matrix. Our default option is left-symmetric which is the best for large
reads. Other recommended value is left-asymmetric.
Left-Asymmetric Algorithm
Unit
S0
Unit
S1
Unit
S2
Unit
S3
0 1 Parity Parity
2 Parity Parity 3
Parity Parity 4 5
Parity 6 7 Parity
8 9 Parity Parity
Left-Symmetric Algorithm
Unit
S0
Unit
S1
Unit
S2
Unit
S3
0 1 Parity Parity
3 Parity Parity 2
Parity Parity 4 5
Parity 6 7 Parity
8 9 Parity Parity
Right-Asymmetric Algorithm
Unit
S0
Unit
S1
Unit
S2
Unit
S3
Parity Parity 0 1
2 Parity Parity 3
4 5 Parity Parity
Parity 6 7 Parity
8 9 Parity Parity
Right-Symmetric Algorithm
Unit
S0
Unit
S1
Unit
S2
Unit
S3
Parity Parity 0 1
3 Parity Parity 2
4 5 Parity Parity
Parity 6 7 Parity
Parity Parity 8 9