一致持久的带外虚拟化系统

存储虚拟化能够全面提升存储区域网络的服务质量，而带外虚拟化与带内虚拟化相比具有性能高和扩展性好等优点．提出了运用按序操作、REDO日志以及日志完整性鉴别，共同保证带外虚拟化跨越系统崩溃或断电事故后仍旧可用；设计了一种基于关系模型的磁盘上虚拟化元数据组织方式，它具有可读性好和容易修改的优点；给出了通过分析磁盘分区表兼容典型遗留存储系统的有效方法，它具有庞大遗留系统零切割时间的特点．基于上述关键技术实现的原型系统，在典型实验中表现了很好的性能．

A Persistent Out-of-Band Virtualization System

Storage virtualization can enhance the overall quality of service in storage area networks. Out-of- band virtualization, in contrast with in-band virtualization, has the advantages of high performance and good scalability. In this paper, a policy for guaranteeing the persistent consistency of virtualization metadata is proposed, which enables out-of-band virtualization to survive panics and power failures by means of ordered operations in a virtualization transaction, REDO logging and log integrity checking. An Organizing mode of the on-disk virtualization metadata is described, which is human-readable and easy to modify due to the introduction of a relation model. An effective approach which obtains the volume layout by analyzing the partition tables on legacy disks is presented for integrating typical legacy storage systems, and little time is needed to upgrade large legacy systems by the approach. The implemented prototype based on these key technologies demonstrates its ability to provide high performance in the representative experiments.