外文翻譯----文件系統(tǒng)虛擬化和服務(wù)網(wǎng)格數(shù)據(jù)管理-免費閱讀
【正文】 s behaviors and needs. Because an optimization tailored for one application (., aggressive prefetching of file contents) may result in performance degradation for several others (., sparse files, databases), applicationtailored features are typically not implemented in generalpurpose O/S kernels. In addition, kernellevel modifications are difcult to port and deploy, notably in shared environments. Toolkitbased solutions typically give users powerful APIs to program remote data access with desired behaviors, but few programmers are skilled to make efective use of such APIs. To solve this problem, userlevel DFS customizations are proposed to support applicationtailored GVFS data sessions. In particular, enhancements designed for gridstyle environments are provided upon the virtualization layer in GVFS, which include customizable disk caching and multithreading for highperformance data access, efcient consistency protocols for applicationdesired data coherence, strong and gridpatible security for secure gridwide data access, and reliability protocols supporting applicationtransparent failure detection and recovery. Based on GVFS, data sessions can be created on demand on a perapplication basis, where each session can apply and configure these enhancements independently to address its application39。它們支持靈活的控制在生命周期和數(shù)據(jù)會話的配置，并可以探索知識應(yīng)用程序（如數(shù)據(jù)訪問模式，數(shù)據(jù)共享方案，和服務(wù)質(zhì)量要求）來定制的性能，使用他們的數(shù)據(jù)會話的一致性，安全性和可靠性增強。數(shù)據(jù)會話需要 在 動態(tài)的基礎(chǔ)上建立和銷毀的生命周期的應(yīng)用程序和它們的實例和數(shù)據(jù)存儲的位置 。此外，內(nèi)核級的修改是難以港口和部署，特別是在共享環(huán)境。此外，該方法是基于用戶級的虛擬化技術(shù)，它不要求改變現(xiàn)有 216。 ，以解決三個重要的問題 應(yīng)用程序透明的電網(wǎng)范圍內(nèi)的數(shù)據(jù)訪問 第一個問題是，如何提供應(yīng)用程序透明的并網(wǎng)范圍內(nèi)的數(shù)據(jù)訪問？ 不同于傳統(tǒng)的分布式網(wǎng)格，因為他們的計算環(huán)境 的 鮮明的特點，例如，廣域網(wǎng)絡(luò)，異構(gòu)的終端系統(tǒng)，與不相交 的 管理域。最后但并非最不重要的，在一個大的，動態(tài)的數(shù)據(jù)管理系統(tǒng)的配置也欲望靈活的控制和遠程數(shù)據(jù)訪問的自動優(yōu)化，以與眾多的應(yīng)用程序提供數(shù)據(jù)的復(fù)雜性協(xié)議，以靈活地適應(yīng)不斷變化的環(huán)境，并提供應(yīng)用所需的性能，安全性和可靠性。在機器和網(wǎng)絡(luò)故障可發(fā)生在任何時間和非專用資源可以動態(tài)加入和退出制度。文件系統(tǒng)虛擬化和服務(wù)網(wǎng)格數(shù)據(jù)管理 摘要 ： 根據(jù)計算的大小和行政區(qū)劃來看，它的規(guī)模在日益增大。另一方面，應(yīng)用根據(jù)需要啟動和終止，以及他們的工作量也隨著時間的推移會有所不同。 為了應(yīng)對這些挑戰(zhàn)，本文提出了兩個層次的數(shù)據(jù)管理系統(tǒng)中，文件系統(tǒng)虛擬化應(yīng)用提供定制網(wǎng)格范圍內(nèi)的數(shù)據(jù)接入和服務(wù)為基礎(chǔ)的中間件使數(shù)據(jù)自動管理供應(yīng)。在局域網(wǎng)絡(luò)（ LAN） 里的 這些差異帶來的數(shù)據(jù)管理的新挑戰(zhàn)系統(tǒng) 和 成功的技術(shù)，例如，局域網(wǎng)文件系統(tǒng)，不能直接應(yīng)用在網(wǎng)格環(huán)境。 /不銹鋼并可以方便地部署在網(wǎng)格資源。工具包為基礎(chǔ)的解決方案通常為用戶提供強大的 API 方案遠程數(shù)據(jù)訪問與期望的行為，但很少有熟練的程序員利用這些 API 的有效利用。 會議定制的數(shù)據(jù)也意味著按照所需的行為和周圍的環(huán)境各相關(guān)因素的 考慮許多參數(shù)和調(diào)整。這些服務(wù)還提供可互操作的接口允許與其他網(wǎng)格中間件服務(wù)和自動化的直接相互作用數(shù)據(jù)處決供應(yīng)任務(wù)。s needs. Therefore, the answer to the second question is to use the applicationtailored enhancements enabled by GVFS to provide gridwide data sessions with applicationdesired performance, consistency, security, and reliability. ServiceBased Autonomic Data Management The third question is, how to manage data provisioning in a gridscale system with dynamically changing environments? Based on the GVFS approach, data sessions can be started on demand and independently customized for applications. However, in a largescale system, the management of many dynamic data sessions is another challenging task due to its plexity. Data sessions need to be dynamically established and destroyed based on the lifecycles of applications and the locations of their instantiations and data storage. Customization of data sessions also implies the consideration of various relevant factors and tuning of many parameters, in accordance with the desired
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