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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

1 2 ... 92 93 94 95 96 97 98 99 100 101 102 ... 253 254

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Dell DCL and 3 Guide de l'utilisateur Page 97