Compaq External RAID Controller & Subsystem Infortrend Instrukcja Użytkownika Pobierz pdf (Strona 22)

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Storage Industry Overview

PROMISE Technology Inc. and Dataquest forecast that in between 2001 to 2005,

Serial ATA RAID is going to have a compound annual growth rate of about 56%.

3.2.3 Market segment and definition (3): Storage file transfer protocol

3.2.3.1 File-Based transfer storage system

File transfer protocol uses file as an unit, NAS connected within TCP/IP architecture is

such an example. Since file layer protocol controls file down to its name and attribute,

therefore, its technical level is higher than Block layer; the major benefit of using file as

transmission unit is that it is more convenient to the user, however, its disadvantage is

that it could easily cause traffic jam due to shortage in network bandwidth.

z Network-attached storage system NAS

z Switched NAS

3.2.3.2 Block-Based transmission storage system

File transfer protocol is based on Block as unit, the protocols which control IDE, SCSI

and FC are such examples; the general DAS, SAN all belong to this type of

Block-Based storage system.

z Scalable Storage Subsystems

z Non-Scalable Storage Subsystem (Disk and magnetic tape)

z Network related device or accessory (Appliance, router,

Hub/Switch/Director)

3.2.4 Main functions of storage system

z Scalability:

As internet data grows several times each year by following “Moore’s law”, storage

architecture changes its face too from “Server-Centric” to “Storage-Centric”. Therefore,

facing the trend of several times increase in the amount of future data, the scalability of

a storage system should be seen as a first priority; that is to say, how to let the storage

system in a company to own the maximum flexibility and scalability yet under the

minimum budget; and how to take care of also its compatibility to other system or

platform so that IT personnel can easily set up and manage the system without new

expense on the new installation.

z Stability/Reliability

It is a system that possesses Back-up capability and 100% Fault-Tolerant mechanism

so that it will not cause malfunctioned or damaged storage system due to the accident

caused by any component. Currently, the online hardware backup method is commonly

used to share the possible risk of malfunctioned machine, these include RAID storage

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