基于COW( Copy- o n-Write) 读写模式的虚拟块设备有利于实现大规模虚拟机环境下虚拟机的快速部署. 文中为虚拟机管理器中的COW 虚拟块设备设计了一种优化方法, 能够提高COW 磁盘的访问性能以及生成多个 小尺寸的COW 磁盘映像文件, 以降低通过网络部署虚拟机的开销.-Design an optimized method for Virtual Machine Manager COW virtual block device conducive to the reali

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for calculate submask for you, yeah...just for you, oke,sip cow