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分離壓縮與非壓縮資料於SMR裝置上提升RAID5系統效能

為了解決SMR PMR的問題，作者林庭玉 這樣論述：

目前HDD中PMR的技術已到達了瓶頸，為了增進硬碟的儲存容量，因此又產生出新的SMR技術。然而，由於SMR特殊的磁軌排序設計，使得SMR無法良好的實現隨機寫入，而被限制在循序寫入。除此之外SMR在修改或寫入新的資料時，資料不會在原有的磁軌上進行寫入，而是會寫在緩衝磁區或末端的磁碟空白處。先前寫入資料會保留直到硬碟閒置時執行資料回收，這些資料才會被釋放出空間提供後續的資料寫入。當進行連續寫入動作使得SMR必須一邊處理舊有資料，一邊進行新資料寫入，這會使SMR的效能很差並且會衍生出寫入放、partial parity等問題，RAID為PMR之常用採用之系統架構設計，由於SMR為PMR的技術延伸，

因此我們以RAID5的基礎架構下提出了S-RAID的架構。這項設計主要是以RAID5搭配B+ Tree的方式，希望可以加快資料找尋、讀取、寫入的速度，並在資料寫入之前依照資料分類，將資料寫入不同的磁碟區域，以來改善上述的問題。在後續實驗部分，我們比較了SMR與S-RAID關於資料寫入、資料回收數與資料回收重新運算等三個項目，發現相關問題皆有獲得改善。關鍵詞: 主機管理疊瓦磁記錄、容錯式磁碟陣列、同位元資料、壓縮資料、非壓縮資料。

HSTL: Half-Shingled Translation Layer for SMR

為了解決SMR PMR的問題，作者張代杰 這樣論述：

Shingled magnetic recording (SMR) is an extension of Perpendicular magnetic recording (PMR) technology, which can increase areal density by overlapping the neighboring tracks.However, SMR has some restrictions that may reduce performance during the random writes, and the time-consuming cleaning pro

cess for the persistent cache of SMR will cause the response time to suddenly increase.HSTL (Half-Shingled Translation Layer) is a novel idea of drive-managed SMR, which proposes the half-shingled zone that can not only in-place update the data without data loss but also increase the storage density

compared to the traditional hard disk, and the full-shingled zone that retains some advantages of persistent cache to reduce the Read-Merge-Write operations.The Zone Converter of HSTL can efficiently execute a cleaning process to reclaim more space, and the latency of cleaning can be greatly improv

ed so the system response time can be smooth.The simulated SMR is implemented to evaluate the experimental results, the results show that the average response time can be reduced by 18.39% on average, and the write amplification can be reduced by 87.99% on average.