TFT-LCD缺陷檢測過程之超大型檔案儲藏庫資訊生命週期管理機制

Information Lifecycle Management for Very Large File Repositories in TFT-LCD Defect Inspection

楊明祥(Ming-Hsiang Yang) ； 曾守正(Frank S.C. Tseng)

《資訊管理學報》 16卷2期 (2009/04) Pp. 103-127

https://doi.org/10.6382/JIM.200904.0103

摘要

TFT-LCD已是台灣最重要的產業之一，由於產品應用範圍已擴大至電視，讓玻璃基板尺寸的需求愈來愈大，也使得玻璃基板或面板缺陷點數直線上升，導致存放這些缺陷點數影像檔的檔案伺服器(Server)容量及效能需求也已經膨脹到讓連當代最新的作業系統都無法負荷的情況。因此，如何重新設計整體伺服器的處理架構以滿足需求，已經是各家TFT-LCD製造公司都要面對的一大挑戰。
本研究採用兩個方法來改善伺服器的效能問題，第一是導入資訊生命週期管理(Information Lifecycle Management, ILM)架構，使用資料庫即時紀錄檔案路徑，供程式刪除過期檔案的搜尋使用，以解決搜尋巨量檔案對伺服器效能所產生的影響。實際驗證的結果顯示：資訊生命週期管理系統架構可以有效改善程式每天清除過期檔案時，所產生的效能嚴重低落問題，而且可以縮短程式執行的時間。實驗結果顯示，當檔案數量很多時，至少可以節省1/3的程式執行時間。另一個方法是參考延伸雜湊(Extendible Hashing)的方法，發展出一種分散式檔案系統，讓所有檔案平均分佈在這些伺服器裡，解決伺服器在空間管理上所衍生的效能低落問題。並以某TFT-LCD製造廠的5代及7.5代廠當作例子，列出兩種不同世代廠的伺服器磁碟空間使用量與建置成本預估。從兩種建置方案的成本預估比較可以發現：使用分散式檔案系統約可節省45%~55%的建置成本，符合TFT-LCD產業降低成本的趨勢，可協助大幅提昇台灣廠商在該產業上的國際競爭力。

關鍵字

延伸雜湊 ； 分散式檔案系統 ； 伺服器效能 ； 資訊生命週期管理

並列摘要

TFT-LCD manufacturing is a very important industry in Taiwan. Because TFT-LCD panels have been applied to TV products, the glass size of TFT-LCD grows up tremendously. This causes the number of defects in glasses also increase rapidly, which in turn makes the disk space of file servers have to be expanded accordingly. Due to such tough situation, the performance and disk space in file servers may reach the limitation of the underlying operating system. Therefore, how to reconfigure the file system architecture to alleviate such phenomenon has becoming a big challenge for most of the TFT-LCD manufacturers.
In this paper, we will propose two approaches to respectively mitigate the maintenance operation and improve the file server performance. The former approach uses information Lifecycle Management (ILM) architecture to store all file information into a database. Because file searching operations are transformed into database operations, this makes the deletion of expired files be a lightly impact to file servers. The other one develops a distributed file system based on extendible hashing scheme to evenly distribute files to file servers. We have conducted experiments respectively based on examples applied to the processes of the 5th and 7.5th generation TFT-LCD manufacturing factories of a manufacturer in Taiwan to assess the diskspace and investment cost. Based on our study, we found our approach can substantially save approximately 45%~55% establishment cost. We believe that will promote the core competence of the Taiwan's TFT-LCD industry.

並列關鍵字

Extendible Hashing ； Distributed File System ； File Server Performance ； ILM Information Lifecycle Management

參考文獻

黃華、楊德志、張建剛(2004)。分布式文件系統。資訊技術快報。10，4-5。

展茂光電

友達光電

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