Compaq External RAID Controller & Subsystem Infortrend Instrukcja Użytkownika Pobierz pdf (Strona 23)

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Storage Industry Overview

system, clustering system, backup power supply, backup electric fan, etc..

z Availability:

It mainly the back-to-online and system operation recovery capability when system is

down, this is to prevent failure and to shorten the recovery time. For example, high

availability means the operation rate of the system is increased to 99.999%, this is

equivalent to only about 5 minutes of machine down time in each year.

Availability can be divided into different levels:

1. Basic availability (95% uptime): Good backup and recovery

2. Reinforced availability (99% uptime): This includes basic

availability

component, advanced backup/recovery, basic disk management, and RAID

0/1/5 and hardware backup.

3. High availability (99.999% uptime):

These include availability component,

advanced disk management, copying, clustering and third-mirror break-off.

Fault-tolerant (100% uptime): These include availability component, 4-node

clustering and further hardware backup.

Source: taiwan.cnet.com

z I/O Performance:

Storage system has to face massive digital data transmission and multiple persons

on-line data Read/Write in the same time, it can effectively enhance access speed;

besides, how to maximize transmission performance under limited bandwidth is also a

consideration in selecting storage system. 以FC來說，可提供每秒2Gbps之傳輸效能.

z TCO (Total Cost of Ownership)

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Compaq External RAID Controller & Subsystem Infortrend Instrukcja Użytkownika Strona 23