LSI 9690SA-8E-KIT Przewodnik Instalacji Pobierz pdf (Strona 24)

Chapter 1. Introduction to the 3ware Command Line Interface

16 3ware SATA+SAS RAID Controller Card CLI Guide, Version 10.2

Hot Spare

A hot spare is a single drive, available online, so that a redundant unit is

automatically rebuilt without human intervention in case of drive failure.

Determining Which RAID Level to Use

The type of RAID unit (array) that you create depends on your needs. You

might want to maximize speed of access, total amount of storage, or

redundant protection of data. Each type of RAID unit offers a different blend

of these characteristics.

The following table summarizes RAID configuration types.

You can create one or more units, depending on the number of drives you

install. The following table provides possible configurations based on your

number of drives.

Table 2: RAID Configuration Types

RAID Type Description

RAID 0 Provides performance, but no fault tolerance.

RAID 1 Provides fault tolerance and a read speed advantage over non-

RAID disks.

RAID 5 Provides performance, fault tolerance, and high storage

efficiency. RAID 5 units can tolerate one drive failing before

losing data.

RAID 6 Provides very high fault tolerance with the ability to protect

against two consecutive drive failures. Performance and

efficiency increase with higher numbers of drives.

RAID 10 Provides a combination of striped and mirrored units for fault

tolerance and high performance.

RAID 50 Provides a combination of RAID 5 and RAID 0. RAID 50 provides

high fault tolerance and performance.

Single Disk Not a RAID type - but supported as a configuration.

Provides maximum disk capacity with no redundancy.

Table 3: Possible Configurations Based on Number of Drives

Number of

Drives

Possible RAID Configurations

1 Single disk

2 RAID 0 or RAID 1

1 2 ... 19 20 21 22 23 24 25 26 27 28 29 ... 137 138

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LSI 9690SA-8E-KIT Przewodnik Instalacji Strona 24