本文介绍了如何在Hyper-V环境下为运行Ubuntu 18.04的虚拟机压缩VHDX动态扩展磁盘。Ubuntu 14.04及更高版本支持TRIM命令，当文件被删除时，操作系统会通知磁盘释放空间。为了成功压缩，需要清除所有已删除块的数据，因为操作系统仅标记这些块为已删除，而不实际擦除。文章提供了快慢两种方法进行Hyper-V Ubuntu VM的Trimming和压缩操作。
If you configured your Hyper-V virtual machines with dynamically expanding virtual disks you will find that the VHDX files backing the virtual disks always grow in size, they never shrink. This article shows how to do it for Ubuntu Linux VMs.
- Faster Trimming & Compacting of Hyper-V Ubuntu VMs
Ubuntu running in a Hyper-V virtual machine has been supporting the trim command since version 14.04. The OS issues trim commands when files are deleted to tell the disk that the blocks occupied by the files can be used elsewhere. The hypervisor cannot know when blocks are ready to be reused unless the VM tells it.
# To tell the hypervisor which blocks can be reused issue the following command:
s
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