Saturday, June 18, 2011

甚麼是雲計算?

喬布斯金口一開說「 iCloud」,勝過人家千言萬語!當然,除了蘋果Amazon Google也有它們的雲服務,前者不久前推出了 Cloud Drive,後者更強調雲根本就在他們的 DNA裏!

不過,雲計算(台譯「雲端運算」)究竟是甚麼?的確,雲計算對不同的人,會有不同理解。有些人把雲當為把伺服器放在數據中心託管,甚至只是網站寄存的新代名詞;也有些人認為,使用 Gmail這些應用,就是把電郵放上雲端。

另外一些人聽過了「 XaaS」,甚麼「 X」也可以有服務提供(「 aaS」即指 as a service),而最多人聽過的「 SaaS」,就是以服務形式提供軟件應用,最成功的例子大概是 Salesforce.com,但也有人說,這不過是十多年前的 ASP(應用服務供應商)的新瓶舊酒而已。

擺脫買軟硬件束縛

事實上,雲計算的確是有其新元素、新意思。在硬件和基建層面,新的數據中心技術和刀鋒伺服器等,令電腦運算效率大增,但也能夠變得較為節能;但更重要的可能卻是在軟件方面的新發展,如「虛擬化」技術和「虛擬機器」( Virtual machine)的概念,例如 Amazon的 EC2( Elastic Compute Cloud),用戶不用真的擁有,也可以「租用」虛擬的伺服器和儲存器。

這些例子都算是雲計算,但除了從技術角度理解,我們也可以從使用模式解讀雲。中國雲基地的技術總監張福波博士,把雲形容為「普惠勞動大眾」,就是能把電腦和網絡使用成本降至任何人都能負擔,或政府能有資源向所有人提供「公有雲」。

雲計算概念最「革命性」的思想,是用戶可擺脫購買硬件和軟件的束縛,將被「用多少、付多少」的「計算」取代,換句話說,雲計算將會變成用電一樣,甚至成為公共服務的一部份。

所以,如果把雲計算當為個別數據中心技術或軟件工具,就難怪有人會認為它只不過是新瓶舊酒,但雲計算應被正視為改變整個資訊傳播和計算服務鏈的新體系。

2011年6月18日 刋載於《蘋果日報》

6 Comments:

At 5:07 PM, Blogger Arunachalam Masanamuthu said...

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At 5:07 PM, Blogger Arunachalam Masanamuthu said...

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At 5:07 PM, Blogger Arunachalam Masanamuthu said...

Peridot Systems .100% job oriented training with placement support and well defined quality management systems in Peridot system .The Leading It Service Providers located in Chennai ADYAR.

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At 5:07 PM, Blogger Arunachalam Masanamuthu said...

Peridot Systems .100% job oriented training with placement support and well defined quality management systems in Peridot system .The Leading It Service Providers located in Chennai ADYAR.

manual software testing training in chennai adyar with placement

 
At 5:07 PM, Blogger Arunachalam Masanamuthu said...

Peridot Systems .100% job oriented training with placement support and well defined quality management systems in Peridot system .The Leading It Service Providers located in Chennai ADYAR.

manual software testing training in chennai adyar with placement

 
At 5:07 PM, Blogger Arunachalam Masanamuthu said...

Peridot Systems .100% job oriented training with placement support and well defined quality management systems in Peridot system .The Leading It Service Providers located in Chennai ADYAR.

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