Spring Switzerland GmbH Ver. 1.61 RAID 5 layout parity-algorithm, RAID 6 layout parity-algorithm

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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	Unit	Unit	Unit
S0	S1	S2	S3
0	1	2	Parity
3	4	Parity	5
6	Parity	7	8
Parity	9	10	11
12	13	14	Parity
Right-Asymmetric Algorithm
Unit	Unit	Unit	Unit
S0	S1	S2	S3
Parity	0	1	2
3	Parity	4	5
6	7	Parity	8
9	10	11	Parity
Parity	12	13	14

Left-Symmetric Algorithm

Unit	Unit	Unit	Unit
S0	S1	S2	S3
0	1	2	Parity
4	5	Parity	3
8	Parity	6	7
Parity	9	10	11
12	13	14	Parity
Right-Symmetric Algorithm
Unit	Unit	Unit	Unit
S0	S1	S2	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	Unit	Unit	Unit
S0	S1	S2	S3
0	1	Parity	Parity
2	Parity	Parity	3
Parity	Parity	4	5
Parity	6	7	Parity
8	9	Parity	Parity
Right-Asymmetric Algorithm
Unit	Unit	Unit	Unit
S0	S1	S2	S3
Parity	Parity	0	1
2	Parity	Parity	3
4	5	Parity	Parity
Parity	6	7	Parity
8	9	Parity	Parity

Left-Symmetric Algorithm

Unit	Unit	Unit	Unit
S0	S1	S2	S3
0	1	Parity	Parity
3	Parity	Parity	2
Parity	Parity	4	5
Parity	6	7	Parity
8	9	Parity	Parity
Right-Symmetric Algorithm
Unit	Unit	Unit	Unit
S0	S1	S2	S3
Parity	Parity	0	1
3	Parity	Parity	2
4	5	Parity	Parity
Parity	6	7	Parity
Parity	Parity	8	9