基于 NBD 的弹性云存储研究与设计

摘要

At present ,the cloud storage service widely used currently that still have lots of problems like the limited size and data security besides of a few good feature .To solve these issues ,a new cloud store module based on network block device — the elasticity of cloud storage is proposed ,which is easily operated by users .Network block device acts as the in‐terface between the server and the client ,and provides a virtual disk back‐end storage service via the HLFS to the elasticity of cloud storage .This approach realizes the distributed storage function and fault‐tolerant control of the file function and so on . The test result shows that this approach increases the disk size ,has no limitation on single file .In additions ,reading and writing data consistency can effectively prevent the data loss .%目前市场上各大厂商提供给用户的云存储服务都有各自的特点，针对其普遍存在的容量大小受限、单文件大小限制、数据安全等问题。提出了基于网络块设备的弹性云存储的模型，实现一个简单易操作的符合基本用户实际使用的弹性云存储系统。该模型采用 NBD（Network Block Device）作为客户端与服务器交互的接口，以 HLFS（Hadoop Log‐Struc‐tured File System）为弹性云平台提供虚拟磁盘后台存储服务，实现文件的分布式存储及容错控制等。测试结果表明，该方式能有效自动增加磁盘容量，对单文件大小无限制，读写数据一致并且能有效防止数据遗失。