Compaq External RAID Controller & Subsystem Infortrend Instrukcja Użytkownika Pobierz pdf (Strona 41)

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Storage Industry Overview

iSCSI will be an important technology to bring up SAN application

iSCSI represents a standard communication protocol, it packs SCSI command into

TCP/IP packet, SCSI command is transferred through Block method in different IP

networks, therefore, it can speed up the data transfer in intranet, besides, the storage

can be managed remotely. It is generally known that iSCSI protocol will be the key

technology that will bring the rapid growth in local area network SAN, it is believed to

enhance the transfer function and efficiency of stored data. Due to the popularity of IP

network, iSCSI can transfer data through LAN, WAN or internet. The difference

between SAN network and Network-Attached Storage gradually becomes hazy, the

emergence of iSCSI is going to speed up this development further. iSCSI was

proposed earliest by giant suppliers such as: Adaptec, Cisco, IBM, etc.; currently, it has

solutions such as: HBA, chip, software or storage network card, etc.

Comparison between SAN and NAS

SAN NAS

Communication

protocol

iSCSI

FC Fiber channel

TCP/IP

Data

transmission

object

Block File

Transmission

efficiency

2.5Gbps~10Gbps 10/100 Mb, 1Gbps, 10Gbps

Cable

transmission

distance

Up to 10 Kms -

Access speed High access speed, this is

because SAN is dedicated

network environment.

Better than traditional storage

system, but it consumes

network bandwidth and is

easy to be affected by

network environment.

Storage

resource

allocation

Modularized storage and

concentrated management

Distributed node storage,

distributed management

Data share Good Normal

Installation

flexibility

Normal Good

Limitation by

data type

No Not suitable for data that

needs large operation or

massive data transfer

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