Compaq External RAID Controller & Subsystem Infortrend Uživatelský manuál stáhnout pdf (Strana 36)

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Storage Industry Overview

4.1 DAS (Direct Attached Storage)

It is a storage system directly connected to the server (based mainly on SCSI protocol),

called DAS. DAS currently is still the mainstream of storage system, it

occupies about 60-70% of the whole storage system market. Since DAS is

connected to server directly and mostly connected through mature SCSI

technology, therefore, it is very easy to be installed and connected and easy

to be understood; it is easily to be adopted when the enterprise is installing

its storage architecture in the initial stage; general startup or small sized

companies usually uses DAS storage system.

According to the definition by Dataquest, DAS can be divided into three smaller types:

Independent and externally connected storage system - External RAID

Controller-Based Storage

Storage device is separated from server, it includes disk array controller, multiple hard

discs, it is an independent disk array storage system. The UltraTrak SX (vertical

type)/RM (rack mount) disk array cabinet product series of PROMISE Technology, Inc

all belong to this type.

Built-in externally connected storage system Host-Attached - External RAID

Storage

Storage device is separated from server, but disk array controller is installed inside the

server. Storage system is formed by many hard discs, it is used specifically for the

execution big capacity backup job, it is thus also called JBOD (just a bunch of disks)

and is rarely used in general enterprises.

Built-in storage system Host-Attached - Internal RAID Storage

The storage device is integrated inside the server, disk array controller and multiple

hard discs are all built in directly inside the server. For example, FastTrak TX series

(RAID 0,1,0+1 array card), FastTrak SX series (RAID 5 array card) and SuperSwap

series ( disk array hot-swap box) of PROMISE Technology Inc. all belong to

applications in the built-in disk array storage system.

Server

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PROMISE Techno ts reserved.logy, Inc. All righ

DAS Storage

(Tower)

DAS

Storage

SCSI

Transmission interface

TCP/IP

Network transmission interface

Client

(Rack mount)

LAN/WAN

Local area network

Server (Rack mount)

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