Spring Switzerland GmbH ENTERPRISE iSCSI Open-E Ver. 1.61 Manuel D’Utilisation
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.
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
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
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
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
4 5
Parity
Parity
Parity
6 7
Parity
Parity Parity
8 9