Chapter 8
Post-Installation Global Parameters Configurations
125
RAID 5
In a RAID level 5, data is striped across the drives in the volumes in segments, with
parity information striped across the drives, as well. Because of this parity, if a single
drive fails, data can be recovered from the remaining drives. Two drive failures
cause all data to be lost. A RAID 5 volume has the data capacity of all the drives in
the LUN, less one. For example, a five-drive RAID 5 volume with 18-Gbyte drives
has a data capacity of 4 x 18 = 72 Gbytes.
TABLE 8-3
shows the data blocks in a RAID
5 volume. The location of the parity drive in the stripe rotates from right to left in
order to eliminate a performance bottleneck.
Configuring RAID Levels
The Sun StorEdge T3+ array is preconfigured at the factory with a single LUN, RAID
level 5 redundancy, and no hot spare. After a volume has been configured, you
cannot reconfigure it to change its size, RAID level, or hot-spare configuration. You
must first delete the volume and create a new one with the configuration values you
want.
TABLE 8-3
RAID 5 Data Blocks
1
1. Block numbers are written in hexadecimal notation.
Stripe
Drive1
Drive2
Drive3
Drive4
Drive5
Drive6
Drive7
Drive8
Drive9
0
0
1
2
3
4
5
6
7
P
1
9
A
B
C
D
E
F
P
8
2
12
13
14
15
16
17
P
10
11
3
1B
1C
1D
1E
1F
P
18
19
20
4
24
25
26
27
P
20
21
22
23
5
2D
2E
2F
P
28
29
2A
2B
2C
6
36
37
P
30
31
32
33
34
35
7
3F
P
38
39
3A
3B
3C
3D
3E
8
P
40
41
42
43
44
45
46
47
9
48
49
4A
4B
4C
4D
4E
4F
P
Содержание StorEdge T3+
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