Compaq External RAID Controller & Subsystem Infortrend Bedienungsanleitung PDF herunterladen (Seite 18)

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Storage Industry Overview

3.1.4 RAID controller

As compared to host RAID HBA, RAID controller usually exists in a storage system

which is excluded from the server, it can be connected externally and serially to 15 sets

of device based on SCSI interface; normally, SCSI hard disc is adopted as the hard

disc within storage system, however, due to cost consideration, there is a trend that

many storage systems gradually adopt ATA or Serial ATA hard disc.

RAID controller connects at one end to internal hard disc for communication and array

management and at another end to external server host for good data I/O

performance, therefore, the following characteristics are important, such as its

compatibility to operation system on the host end, Failover redundant capability, its

support to all kinds of backup components (for example, backup power supply,

backup electric fan, backup hard disc), etc.; therefore, RAID controller is more

complicated in design than other PC products, besides, user friendly nature of design

in the array management software is very important too.

Types and application of RAID controller

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Compaq External RAID Controller & Subsystem Infortrend Bedienungsanleitung Seite 18