雲端運算(Cloud computing)淺談

雲端運算 是2010裡的超級熱門話題
無論是 有用過  還是沒有用過的 知道的  一知半解的  甚至傻傻分不清的 都很用力的談論著
就像  到處可以看到聽到用到感受到iphone無所不在的強大  無論你有沒有Iphone


先來看看Wiki怎麼解釋'雲端運算'Cloud computing
(天下文章抄抄抄  我自首...資料來自: http://en.wikipedia.org/wiki/Cloud_computing)
(中文板)
雲端運算（英文：Cloud computing，中國大陸譯作雲計算），是一種基於網際網路的運算方式，透過這種方式，共享的軟硬體資源和資訊可以按需提供給電腦和其他裝置。整個執行方式很像電網。
(English)
Cloud computing is Web-based processing, whereby shared resources, software, and information are provided to computers and other devices (such as smartphones) on demand over the Internet.


淺詞大意呢 就是你(一般使用者)可以透過web browser連上網路去使用甚至與人共享applications(應用軟體)


就像Gmail裡的Document就是個雲端運算例子
上回去阿根廷玩時  我就在gmail裡create一個excel doc 
將所有的行程 活動 要看的表演 餐廳 甚至各個餐廳必吃必喝 通通整理好放在這Excel Doc  並且Share給大家  當然其他人也可以提供意見和update這份文件
在阿根廷時   就只要找個免費上網的地方login gmail後打開excel檔案 按表操課
很方便  所有information都可以充分而且快速的溝通
PS: 這個用Excel來規劃旅行的Brilliant idea 來自一個特別的朋友b 我還沒如此冰雪聰明


從以上的例子  希望可以給大家有個大概的idea  想像一下雲端大概是做甚麼的  提供甚麼好處...


再來說說雲端的key features  還有Equinix在其中的角色
(天下文章抄抄抄  我自首...資料來自: http://en.wikipedia.org/wiki/Cloud_computing)

• Agility improves with users' ability to rapidly and inexpensively re-provision technological infrastructure resources.
• Cost is claimed to be greatly reduced and capital expenditure is converted to operational expenditure. This ostensibly lowers barriers to entry, as infrastructure is typically provided by a third-party and does not need to be purchased for one-time or infrequent intensive computing tasks. Pricing on a utility computing basis is fine-grained with usage-based options and fewer IT skills are required for implementation (in-house). ^{(重點提示 會考!! 重要!!)   這就是EQUINIX登台的時刻了}
• Device and location independence enable users to access systems using a web browser regardless of their location or what device they are using (e.g., PC, mobile). As infrastructure is off-site (typically provided by a third-party) and accessed via the Internet, users can connect from anywhere.^{(重點提示 會考!! 重要!!)   這也是EQUINIX發揮神力的地方}
• Multi-tenancy enables sharing of resources and costs across a large pool of users thus allowing for: ^{(重點提示 會考!! 重要!!)   這可是大家對EQUINIX歐樂的一項} 
  • Centralization of infrastructure in locations with lower costs (such as real estate, electricity, etc.)
  • Peak-load capacity increases (users need not engineer for highest possible load-levels)
  • Utilization and efficiency improvements for systems that are often only 10–20% utilized.
• Reliability is improved if multiple redundant sites are used, which makes well designed cloud computing suitable for business continuity and disaster recovery. Nonetheless, many major cloud computing services have suffered outages, and IT and business managers can at times do little when they are affected. ^{(重點提示 會考!! 重要!!)   EQUINIX這方面可是拍胸脯掛保證的} 
• Scalability via dynamic ("on-demand") provisioning of resources on a fine-grained, self-service basis near real-time, without users having to engineer for peak loads. Performance is monitored, and consistent and loosely coupled architectures are constructed using web services as the system interface.One of the most important new methods for overcoming performance bottlenecks for a large class of applications is data parallel programming on a distributed data grid.
• Security could improve due to centralization of data, increased security-focused resources, etc., but concerns can persist about loss of control over certain sensitive data, and the lack of security for stored kernels.Security is often as good as or better than under traditional systems, in part because providers are able to devote resources to solving security issues that many customers cannot afford.Providers typically log accesses, but accessing the audit logs themselves can be difficult or impossible. Furthermore, the complexity of security is greatly increased when data is distributed over a wider area and / or number of devices.
• Maintenance of cloud computing applications is easier, since they don't have to be installed on each user's computer. They are easier to support and to improve since the changes reach the clients instantly.
• Metering means that cloud computing resources usage should be measurable and should be metered per client and application on a daily, weekly, monthly, and yearly basis. ^{(重點提示 會考!! 重要!!)   這是EQUINIX辛苦血汗錢的來源} 

 拉拉雜雜說了一堆
希望能給大家一個概念  除了知道雲端大概是甚麼東西  可以為我們做甚麼  便利好處有那些
還有Equinix在其中所扮演的角色 


 雲端將會越來越影響我們日常生活  不只是科技產業的主流  也將是整個世界的主流
Equinix在Data Center界所建立的好口碑  堅固扎實的基礎  優秀的領導團隊  更會好好把握這趨勢  讓Equinix更發光發熱 


PS: 你應該也感受到為什麼我如此拼命的想進Equinix...這可是once in a lifetime的機會!!