EMC Symmetrix DMX-3 User Manual

Symmetrix DMX RAID 6
209
Data Integrity, Availability, and Protection
Figure 47 on page 209 shows a RAID 6 (14+2) data/parity layout.
Figure 47 RAID 6 (14+2)
Rebuilding data and
parity members
RAID 6 has two rebuilding processes: one member rebuild and two
member rebuild.
Note: RAID 6 (6+2) and (14+2) uses permanent sparing functionality. Table 30
on page 210 provides additional information.
0
7
SYM-001301
D1 D2 D3 D4 D5 D6 D7 D8 D9 D10 D11 D12 D13 D14 N N N
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
1614
15
13
14
15
12
13
14
15
11
12
13
14
15
10
11
12
13
14
15
9
10
11
12
13
14
15
8
9
10
11
12
13
14
15
7
8
9
10
11
12
13
14
15
6
7
8
9
10
11
12
13
14
15
5
6
7
8
9
10
11
12
13
14
15
4
5
6
7
8
9
10
11
12
13
14
15
3
4
5
6
7
8
9
10
11
12
13
14
15
2
3
4
5
6
7
8
9
10
11
12
13
14
15
123 45678 910111213 14 15 16
D16
P0
P1
P2
P3
P4
P5
P6
P7
P8
P9
P10
P11
P12
P13
P14
P15
D15
H0
H1
H2
H3
H4
H5
H6
H7
H8
H9
H10
H11
H12
H13
H14
H1516
16
16
16
16
16
16
16
16
16
16
16
16
0
1
2
3
4
5
6
0
1
2
3
4
5
6
0
1
2
3
4
5
6
7
8
0
1
2
3
4
5
6
7
8
9
0
1
2
3
4
5
6
7
8
9
0
1
2
3
4
5
6
7
8
9
10
11
0
1
2
3
4
5
6
7
8
9
10
11
0
1
2
3
4
5
6
7
8
9
10
11
12
1310 12
0
0
01
1
2
1
2
3
0
1
2
3
4
0
1
2
3
4
5
D1
Physical disk 1, in this slice there are 14 data drives, from D1 to D14
D15
Physical disk 15, in this slice it contains the Horizontal Parity
D16
Physical disk 16, in this slice it contains the Diagonal Parity
Null disk is a non existent drive whose contents is always zero but exists solely for the
purpose of the RAID calculations
Special diagonal
One track of 64 K, made by 16 elements of 4 K each
4 K of the Diagonal parity track
P0
is calculated by XOR all 4 K chunks marked
P1
is calculated by XOR all 4 K chunks marked
H
Full track is calculated XOR all 17 horizontal tracks
Horizontal parity doesn’t include the diagonal parity
N
16
P0
0
and XOR all chunks marked
16
1
and XOR all chunks marked
16

EMC Symmetrix DMX-3 Specifications

General

Brand	EMC
Model	Symmetrix DMX-3
Category	Storage
Language	English