5.3.1.3Maximizing Drive Performance
You can configure an array for optimal performance. But optimal drive configuration for one type of application will probably not be optimal for any other application. Table 5.6 lists basic guidelines for the performance characteristics for RAID drive arrays at each RAID level.
Table 5.6 | Performance Characteristics for RAID Levels |
|
|
RAID Level | Performance Characteristics |
|
|
0 | Excellent for all types of I/O activity, but provides no data |
| security. |
|
|
1 | Provides data redundancy and good performance. |
|
|
5 | Provides data redundancy and good performance in most |
| environments. |
|
|
10 | Provides data redundancy and excellent performance. |
|
|
50 | Provides data redundancy and very good performance. |
|
|
Only one RAID level can be assigned to each logical drive. Table 5.7 shows the drives required per RAID level.
Table 5.7 | Number of Physical Drives per RAID Level | |
|
|
|
RAID |
|
|
Level | Minimum # of Physical Drives | Maximum # of Physical Drives |
|
|
|
0 | 1 | 30 |
|
|
|
1 | 2 | 2 |
|
|
|
5 | 3 | 30 |
|
|
|
10 | 4 | 30 |
|
|
|
50 | 6 | 30 |
|
|
|
Configuring Physical Drives, Arrays, and Logical Drives |
Copyright © 2002 by LSI Logic Corporation. All rights reserved.