Applying File Information to Block-Level Content Addressable Storage

被引：1

作者：

Zhang, Youhui ^{[1
]}

Wang, Dongsheng ^{[1
]}

机构：

[1] Tsinghua National Laboratory for Information Science and Technology (TNList), Research Institute of Information Technology, Tsinghua University, Beijing

来源：

Tsinghua Science and Technology | 2009年 / 14卷 / 01期

基金：

中国国家自然科学基金;

关键词：

content-addressable storage; smart disk; virtual machine; virtual storage;

D O I：

10.1016/S1007-0214(09)70005-7

中图分类号：

学科分类号：

摘要：

Content addressable storage (CAS) is a promising technology for improving storage efficiency as well as access throughput. Currently, many CAS products are implemented on the block level, which results in loss of file information. Thus, some sophisticated optimizations cannot be achieved, such as accurate file-prefetching. This paper presents a file-aware block-level storage system combined with the CAS function. In contrast with some existing file-level CAS, this system is transparent to upper-level applications, including the operating system and the file system. These features are achieved by using smart-disk technologies to help the storage system to learn the file-system layout. A prototype was implemented on an open-source virtual machine (VM) with the guest operating system being Windows XP. Tests show that this combination significantly reduces the size of the VM image file and improves the storage performance by discarding unused blocks and using a simple file-level prefetching strategy. © 2009 Tsinghua University Press.

引用

页码：41 / 49

页数：8

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