Adaptec CDP-00278-02-A Betriebsanweisung PDF herunterladen (Seite 115)

Comparing RAID Levels

Use this table to select the RAID levels that are most appropriate for the logical drives on your storage

space, based on the number of available disk drives and your requirements for performance and reliability.

Minimum

Disk Drives

Built-in Hot

Spare

Write

Performance

Read

Performance

Disk Drive

Usage

RedundancyRAID Level

2No******100%NoRAID 0

2No****50%YesRAID 1

3No****50%YesRAID 1E

4No****50%YesRAID 10

3No****67 – 94%YesRAID 5

4Yes****50 – 88%YesRAID 5EE

6No****67 – 94%YesRAID 50

4No***50 – 88%YesRAID 6

8No***50 – 88%YesRAID 60

Disk drive usage, read performance, and write performance depend on the number of drives in the

logical drive. In general, the more drives, the better the performance.

Understanding Drive Segments

A drive segment is a disk drive or portion of a disk drive that is used to create a logical drive. A disk drive

can include both RAID segments (segments that are part of a logical drive) and available segments. Each

segment can be part of only one logical drive at a time. If a disk drive is not part of any logical drive, the

entire disk is an available segment.

115Proprietary and Condential to PMC-Sierra, Inc.

Document No.: CDP-00278-02-A Rev. A, Issue:

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Adaptec CDP-00278-02-A Betriebsanweisung Seite 115