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研究生:方郁勛
論文名稱:具自我調節寫入策略之節能儲存系統 CacheRAID
論文名稱(外文):CacheRAID:An Adaptive Write Cache Policy to Conserve RAID Disk Array Energy
指導教授:石維寬石維寬引用關係
學位類別:碩士
校院名稱:國立清華大學
系所名稱:資訊系統與應用研究所
學門:電算機學門
學類:系統設計學類
論文種類:學術論文
論文出版年:2012
畢業學年度:100
論文頁數:41
中文關鍵詞:節能儲存系統磁碟陣列混合架構系統快取
外文關鍵詞:RAIDHybrid Storage SystemWrite CacheEnergy Conserve
相關次數:
  • 被引用被引用:0
  • 點閱點閱:231
  • 評分評分:
  • 下載下載:34
  • 收藏至我的研究室書目清單書目收藏:1
節能議題已經成為目前儲存技術上最受重視的問題,根據報告指出儲存系統所消耗的電力大約佔了整個資料中心的50%,又另一個數據指出以電費來估計的話,儲存系統所消耗的電費為整個資料中心的27%。

我們分析了兩個真正運作的系統的使用者行為並從中得到了一些啟發。根據我們的分析,在某些特定的系統上(例:網頁伺服器以及數位文獻保存系統),有很大的機會可以藉著關掉閒置的硬碟來達到節能的目的。因此,我們提出了CacheRAID,一個節能的RAID 架構儲存系統。我們設計了三個可自動調整的寫入策略來使CacheRAID節省能源。首先,我們利用檔案被寫入的時間來將檔案進行特殊的配
置以集中彼此有相關性的檔案在某些硬碟中。第二,動態的調整檔案寫入硬碟的時間,以得到更多連續寫入的機會並藉此避免速度較慢的隨機寫入的次數。最後,硬碟監控的機制負責管理硬碟的狀態以及關閉閒置的硬碟。我們實作了CacheRAID 並且實際的運作並測量耗電量,而實驗結果顯示了在特定的系統使用狀況中,CacheRAID最多可以節省71%的能源
Chapter 1 Introduction

Chapter 2 Related Works
2.1 Energy-Conserving RAID Researches
2.2 Property of Storage Media
2.2.1 Hard Drive Power Model
2.2.2 Characteristics of SSD
2.2.3 Summary

Chapter 3 Observation and Motivation
3.1 Energy-aware data allocation and cache
3.1.1 Energy-aware Data Allocation
3.1.2 Energy-aware Cache
3.2 Workloads Analysis
3.2.1 The Data Access Pattern Analysis
3.2.2 Related Data and Localities Analysis
3.3 Cost Analysis

Chapter 4 CacheRAID Policy
4.1 System Architecture
4.2 Policy I : The Skew Time Data Allocation
4.2.1 Read-ahead Destage Order Policy
4.3 Policy II : The Adaptive Data Write Policy
4.3.1 Workload Balance Policy
4.4 Policy III : The Frequency-based Spin-down Mechanism

Chapter 5 Experiment Result
5.1 Implementation
5.2 Power Measurement
5.2.1 Power Measurement Mechanism
5.3 Experiment Methods
5.4 Results
5.4.1 Energy Consumption and Saving
5.4.2 The Spin-down threshold

Chapter 6 Conclusion
6.1 Future Work
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