EMC Symmetrix DMX-3, Руководство по эксплуатации продукта

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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
S YM-001 3 01
D1 D2 D 3 D4 D5 D6 D7 D 8 D9 D10 D11 D12 D1 3 D14 N N N
0
1
2
3
4
5
6
7
8
9
10
11
12
1 3
14
15
0
1
2
3
4
5
6
7
8
9
10
11
12
1 3
14
15
16
16 14
15
1 3
14
15
12
1 3
14
15
11
12
1 3
14
15
10
11
12
1 3
14
15
9
10
11
12
1 3
14
15
8
9
10
11
12
1 3
14
15
7
8
9
10
11
12
1 3
14
15
6
7
8
9
10
11
12
1 3
14
15
5
6
7
8
9
10
11
12
1 3
14
15
4
5
6
7
8
9
10
11
12
1
3
14
15
3
4
5
6
7
8
9
10
11
12
1 3
14
15
2
3
4
5
6
7
8
9
10
11
12
1 3
14
15
1 2 3 4 5 6 7 8 9 10 11 12 1 3 14 15 16
D16
P0
P1
P2
P 3
P4
P5
P6
P7
P 8
P9
P10
P11
P12
P1 3
P14
P15
D15
H0
H1
H2
H 3
H4
H5
H6
H7
H 8
H9
H10
H11
H12
H1 3
H14
H15 16
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
1 3 10 12
0
0
0 1
1
2
1
2
3
0
1
2
3
4
0
1
2
3
4
5
D1 Phy s ic a l di s k 1, in thi s s lice there a re 14 d a t a drive s , from D1 to D14
D15 Phy s ic a l di s k 15, in thi s s lice it cont a in s the Horizont a l P a rity
D16 Phy s ic a l di s k 16, in thi s s lice it cont a in s the Di a gon a l P a rity
N u ll di s k i s a non exi s tent drive who s e content s i s a lw a y s zero bu t exi s t s s olely for the
p u rpo s e of the RAID c a lc u l a tion s
S peci a l di a gon a l
One tr a ck of 64 K, m a de b y 16 element s of 4 K e a ch
4 K of the Di a gon a l p a rity tr a ck
P0
i s c a lc u l a ted b y XOR a ll 4 K ch u nk s m a rked
P1
i s c a lc u l a ted b y XOR a ll 4 K ch u nk s m a rked
H
F u ll tr a ck i s c a lc u l a ted XOR a ll 17 horizont a l tr a ck s
Horizont a l p a rity doe s n ’ t incl u de the di a gon a l p a rity
N
16
P0
0 a nd XOR a ll ch u nk s m a rked 16
1
a nd XOR a ll ch u nk s m a rked
16