基於混合型儲存設備下針對雲端多媒體應用之動態資料遷移

Dynamic Data Migration Of Multimedia Applications On HDD/SSD Based Clouds

劉美蘭(Liou,Meilan)

指導教授 ： 張榮貴

國立中正大學/工學院/資訊工程學系/碩士(2012年)

摘要

為了提高多媒體應用在雲端上的性能以及節省其功耗，我們設計並實作一個基於傳統硬碟與固態硬碟的架構，來解決這些議題。
其中一項就是如何解決大量多媒體數據在雲端網路所造成的壅塞。然而，這個問題跟多媒體的儲存設備是
非常密切相關的。所以我們基於傳統硬碟和固態硬碟的特點來提供優越的頻寬，進而解決這個問題。

在利用資料遷移來增進混合儲存裝置吞吐量的研究中，均沒有掌握到熱門檔案變化的曲線，只著重在發揮固態硬碟的優勢，
決策如何搬移檔案。在系統運作時，對該在什麼時候執行資料搬遷完全沒有細節的描述與規畫。

在本篇論文中，我們呈現了一個在傳統硬碟和固態硬碟之間動態資料遷移的方法，稱為IDDM。
IDDM提供了一個虛擬化的平台，並提出藉由排程虛擬機器找到排程空檔來執行資料搬遷，使得性能提高且不會錯過即時系統的截止期。
與以前的研究作比較，我們的動態資料遷移更加的敏感以及接近使用者行為的曲線，能夠提高在固態硬碟中的命中率，改善
混合儲存裝置的效能。

IDDM能夠利用系統的空檔在混合儲存裝置之間動態的搬遷檔案，且動態的變動熱門檔案的門檻值，提升了系統吞吐量高達30%。

關鍵字

多媒體 ； 混合型儲存設備

並列摘要

To improve performance and save power consumption of multimedia clouds, we have designed and implemented a infrastructure to solve these issues based on HDD/SDD (Hard Disk Drive and Solid State Drive). One of our infrastructure is how to solve the congestion caused by a very large amount of multimedia data. However, this issue is very closely related to the storage device of multimedia applications. Thus to overcome this issue, we must provide bandwidth based on the characteristics of HDD and SDD.

The studies that rely on the data migration to enhance hybrid storage throughput don't grasp the popularity curves. They only focus on the advantages of SSDs to play up the path of the decision to move files, but not to mention when the implementation of the data migration in the system cooperation.

In this paper, we present a dynamic migration mthod called IDDM (Idle-driven Data Migration) to move data between HDD and SDD.
IDDM provides a virtualization platform and proposes a virtual machine scheduler to migrate data between HDD and SDD for good performance gaps without missing the real-time deadline.Compared with the previous work, our dynamic migration is more sensitive and close to the curve of the user behavior change, and enhances the SSD hit ratio to improve performance of the hybrid storage.

IDDM takes advantage of the gap on the scheduler to move files dynamically in hybrid storage and change a threshold, and finally improves system throughput by up to 30%.

並列關鍵字

Multimedia ； Data migration

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