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Configuring PERC 3 95
Maximizing Drive Performance
You can configure an array for optimal performance; however, optimal drive
configuration for one type of application will probably not be optimal for
any other application. A basic guideline of the performance characteristics
for RAID drive arrays at each RAID level is shown in Table 7-9.
Assigning RAID Levels
Only one RAID level can be assigned to each logical drive. The drives
required per RAID level shown in Table 7-10.
5 100% protection through striping and parity. The data is striped and
parity data is written across a number of physical disk drives.
Table 7-9. Performance Characteristics for Each RAID
Level
RAID
Level
Performance Characteristics
0 Excellent for all types of input/output (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 high data transfers and complete data redundancy.
50 Provides high data transfers and data redundancy.
Table 7-10. Physical Drives Required for Each RAID Level
RAID
Level
Minimum Number of
Physical Drives
Maximum Number of Physical
Drives
01 32
12 2
Table 7-8. Fault Tolerance Features for RAID Levels 0, 1
and 5
(continued)
RAID
Level
Fault Tolerance Protection