Compaq External RAID Controller & Subsystem Infortrend Instrukcja Użytkownika Pobierz pdf (Strona 43)

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Storage Industry Overview

4.3 Trend analysis of storage architecture

1. FAS Fabric-Attached Storage mainstream trend---NAS+SAN

Since FAS has advantages such as: direct share over network, good expandability,

longer transmission line, etc. over DAS; although DAS is still the current mainstream

storage system (63%), FAS is going to be future storage system trend, Dataquest

forecasts that total FAS will reach a market share of 60% in 2006.

(US$M) Total FAS/DAS RAID Storage Market

5,000

10,000

15,000

20,000

25,000

30,000

2002 2003 2004 2005 2006

DAS

NAS

SAN

DAS

FAS

Source: Dataquest, (August 2002)

Comparison among DAS, NAS, SAN

DAS NAS SAN

Host connection

interface

PCI, ATA/SATA,

SCSI

TCP/IP iSCSI IP

FCIP, iFCP (fiber)

Network share No Yes (LAN) Good (WAN)

Data transmission

object

Block File Block

Cost Low Medium High

Integration

management

efficiency

Low Medium High

Enterprise scale Medium to

large sized

enterprise

medium and

small sized

enterprise

large sized

enterprise , data

center

Capacity Low, medium,

high

Low to

Medium

High

Different place

disaster recovery

capability

Good Bad Good

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