Gateway Ultra2 Uživatelský manuál stáhnout pdf (Strana 61)

Chapter 5 Configuring ADAC Ultra2 S466

Configuration Strategies, Continued

Maximizing Drive Availability You can maximize the availability of data

on the physical disk drive in the logical array by

maximizing the level of fault tolerance. The levels of fault

tolerance provided by the RAID levels are:

RAID Level Fault Tolerance Protection

0 No fault tolerance.

1 Disk mirroring, which provides 100% data redundancy.

3 100% protection through a dedicated parity drive.

5 100% protection through striping and parity. The data is

striped and parity data is written across a number of physical

disk drives.

10 100% protection through data mirroring.

30 100% protection through data striping. All data is striped

across all drives in two or more arrays.

50 100% protection through data striping and parity. All data is

striped and parity data is written across all drives in two or

more arrays.

Maximizing 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. A basic guideline of the performance

characteristics for RAID drive arrays at each RAID level

is:

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.

3 Provides data redundancy.

5 Provides data redundancy and good performance in most

environments.

10 Provides data redundancy and excellent performance.

30 Provides data redundancy and good performance in most

environments.

50 Provides data redundancy and very good performance.

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Gateway Ultra2 Uživatelský manuál Strana 61