September 2013
Intermediate to advanced
264 pages
5h
Chinese
Content preview from Bad Data 技術手冊
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迷思 2：雲端會為我們省錢
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183
迷思 1：雲端對所有的基礎設施元件來說都是個好的
解決方案
最近這幾年，雲端已經被認為是基礎設施的未來。行銷者使用如「企業資料中心在 20
年之內將會大幅的被雲端運算所取代」以及「公共雲端運算提供許多厲害的可能性，如
以超乎想像極低的成本，依照需求隨時提供超級電腦層級的處理」等的語言。
2
許多顧客
都被此吸引。他們將雲端視為所有基礎設施需求的簡單解決方案。在軟體能夠模擬幾乎
所有硬體的世界中，人們通常使用雲端做任何事情，單純因為他們能夠這樣做，而忽略
了一些事情。能夠建立一個負載平衡器、防火牆或是 RAID 控制器而不用任何昂貴的硬
體的誘惑的確影響了許多人。
這個迷思如何跟 Fred 的故事產生關聯？
另一個虛擬節點無法與專屬硬體的效能與功能性比較的地方就是負載平衡器。儘管有些
昂貴，但如 F5 或 Stingray 跟任何純軟體工具相比，都會產生很棒的結果，並且更容易
配置。兩者都擁有完整的冗餘選項，並且在多個地點之間分散負載時都能運作良好。的
確，有些開發商會提供一些負載平衡的方案，但這些方案的彈性與效能都沒有辦法與硬
體相比。另外，他們是設計用來在網際網路與你的叢集之間的負載平衡，而不是在叢集
中使用的。
迷思 2：雲端會為我們省錢
開始這節之前，我必須要清楚的描述，有效率的使用雲端能夠節省成本。另外，從一個
純財務的觀點來看，使用雲端而不擁有自己的硬體，支出項目從資產支出（CapEx）變
成營業費用（OpEx）。這對 CFO 們來說是很有吸引力的，而也讓 CTO
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I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.