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影响性能的安装过程中，您的客户虚拟机可使用若干虚拟磁盘相关选项。以下图片显示了客机中可用的虚拟磁盘选项。

在 virt-manager 的虚拟磁盘部分可以选择缓存模式、IO 模式和 IO 调试。以上参数可在性能选项下的字段中设置。具体如下图：

图 3.8. 虚拟磁盘性能选项

重要

在设置 virt-manager 中虚拟磁盘性能选项时，虚拟机被重启后才能使设置生效。

编辑客机 XML 配置中设置的设定和指令的描述请参见第 6.3 节 “缓存”和第 6.4 节 “I/O 模式”。