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A New Disk I/O Model of Virtualized Cloud Environment

机译:虚拟化云环境的新磁盘I / O模型

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摘要

In a traditional virtualized cloud environment, using asynchronous I/O in the guest file system and synchronous I/O in the host file system to handle an asynchronous user disk write exhibits several drawbacks, such as performance disturbance among different guests and consistency maintenance across guest failures. To improve these issues, this paper introduces a novel disk I/O model for virtualized cloud system called HypeGear, where the guest file system uses synchronous operations to deal with the guest write request and the host file system performs asynchronous operations to write the data to the hard disk. A prototype system is implemented on the Xen hypervisor and our experimental results verify that this new model has many advantages over the conventional asynchronous-synchronous model. We also evaluate the overhead of asynchronous I/O at host, which is brought by our new model. The result demonstrates that it enforces little cost on host layer.
机译:在传统的虚拟化云环境中,在来宾文件系统中使用异步I / O和在主机文件系统中使用同步I / O来处理异步用户磁盘写入存在一些缺点,例如,不同来宾之间的性能干扰以及来宾之间的一致性维护失败。为了改善这些问题,本文介绍了一种称为HypeGear的新型虚拟化云系统磁盘I / O模型,其中来宾文件系统使用同步操作来处理来宾写入请求,而主机文件系统执行异步操作以将数据写入到硬盘。在Xen虚拟机管理程序上实现了原型系统,我们的实验结果证明,该新模型比传统的异步同步模型具有许多优势。我们还评估了新模型带来的主机异步I / O开销。结果表明,它在主机层上的执行成本很小。

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