Compaq External RAID Controller & Subsystem Infortrend Uživatelský manuál stáhnout pdf (Strana 40)

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Storage Industry Overview

4.2.2 SAN (Storage Area Network)

SAN is to build a high speed network storage architecture dedicated for data transfer. It

isolates each storage system which was originally separated to each server as a

Storage Pool, it can be connected to the server host through Switch or Flow Controller

in Fiber Channel, or connected to existed Ethernet through iSCSI (Internet Protocol

over SCSI) technology. The current market mainstream is Fiber Channel transmission

technology, its largest spec advantages are a transmission speed as high as 2Gbps,

clustering backup of multiple paths and distance layout above 10 kms; in management

aspect, due to the concentrated share of storage resource, no bandwidth between LAN

and server will be consumed; accompanied with management software, the storage

space can be more effectively allocated, and the mutual operation between

heterogeneous platform server and storage system is possible. However, the later

emerging iSCSI has its superiority too, Microsoft announces recently that Windows

operating system will be added with iSCSI storage standard, and iSCSI certification is

launched too. The soc-called iSCSI is to build SAN network through IP transmission by

using existed Ethernet, in other words, enterprise can use Ethernet to build low cost

SAN.

Components of SAN

An infrastructure is needed to build SAN, these include network equipment and device

and storage system such as: fiber interface card is needed in the server host, fiber

cable, Fiber Hub, Switch, Router, etc.; the basic cost will be more than one million NT

dollars, and the installation is complicated too, therefore, very few enterprises use SAN,

medium and small sized enterprise are even difficult to afford. SAN solution is

proposed by Fabric-Attached Storage company such as EMC in later 1990s, it’s not

long since its first use in the enterprise storage environment, therefore, there is no

uniform spec, protocol, standard or operation platform to be followed by enterprise;

therefore, the “compatibility” issue among devices and storage system need to be

considered during the purchase, however, the suppliers seem to notice this issue, they

gradually provide high integration storage solution which can be operated across

heterogeneous platforms.

The optimum SAN solution for medium and small sized enterprise: iSCSI

Since SAN is still immature in both technology and market, it is still in its infant stage,

each supplier has its standard and finds aggressively the support from other related

manufacturers so that it can lead the development of SAN. In order to prevent the

compatibility issue among different devices, IT personnel might have to purchase a

total solution instead of purchasing flexibly a single product. iSCSI emerges to solve

the above problem, it provides a cheaper SAN environment which does not goes

through fiber channel for medium and small sized enterprise.

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