不同特性的組織利用混合雲的最佳化架構分析

Abstract

隨著雲端運算的興起，企業與個人都可以享受到即用即付(pay-as-you-go)模式所帶來的成本優勢及虛擬化技術(virtualization technology)所提供的效益。當頻寬、儲存空間、運算等電腦資源可以如同水電一樣被消費時，人類未來的生活方式以及產業界將產生很大的改變。 然而，雲端運算也面臨了挑戰。考量到資料安全性以及服務層級協議(SLAs)的未臻完善，許多組織仍未採用大型廠商所提供的雲端服務。混合雲(hybrid cloud)由於可以結合私有雲(private cloud)對資料的妥善管控，以及公用雲(public cloud)的低廉成本優勢，被視為是下一個機會。 當混合雲成為一個解決方案時，該如何妥善配置私有雲跟公用雲的比例來將效益最大化？我們將這樣的比例稱為”混合雲架構”(hybrid-cloud architecture)。根據本研究的效能模型(performance model)，我們針對基礎架構及服務(IaaS, Infrastructure as a Service)的部份作深入探討，分析不同混合雲架構下的成本效益。考量了在資料安全以及服務層級協議(SLAs, service level agreements)如系統回應時間上的要求，我們可以客製化地為不同特性及需求的組織提供最佳化混合雲架構的建議。

With the emergence and quick development of cloud computing, both enterprises and individuals enjoy the cost advantage brought by pay-as-you-go model and efficiency which virtualization technology provides. As the bandwidth, storage and computing resources can be consumed in a utility fashion, the industry and the ways of living are anticipated to be greatly revolutionized. While cloud computing yields new opportunities, challenges arise. Data security concern and lack of service level agreements (SLAs) are preventing organizations from adopting cloud services from external vendors. In this context, hybrid cloud seems to evolve as the next big opportunity for combining the advantage of private cloud’s direct control on sensitive data and that of public cloud’s low cost. As hybrid cloud begins to be seen as a solution, the optimal ratio of private and public cloud becomes an issue. We term a strategy of how much percentage should go for private while the rest go for public as “hybrid-cloud architecture”. Based on our performance model, we focus on Infrastructure as a Service (IaaS) category and conduct cost-effective analysis under different hybrid-cloud architectures. Taking into consideration different levels of security requirement and service response time as SLAs, we give customized suggestions on the optimal hybrid-cloud architecture for organizations with various characteristics and requirements.