远程NFS服务器出故障，本机无法ls -l /，无法df -h，无法正常的umount等，需要强制卸载已经挂载的NFS远程目录
You can use umount -f -l /mnt/myfolder , and that will fix the problem.
-f – Force unmount (in case of an unreachable NFS system). (Requires kernel 2.1. ...
-l – Lazy unmount. Detach the filesystem from the filesystem hierarchy now, and cleanup all references to the filesystem as soon as it is not busy anymore.
参考：
https://askubuntu.com/questions/292043/how-to-unmount-nfs-when-server-is-gone
Windows下如果不重启，只能强制停止NFS客户端服务进程，才能彻底删除NFS资源：
首先查询NFS客户端服务进程PID：sc queryex NfsClnt，得到PID号
再taskkill /pid 6676 /f，再mount查看效果，如下图所示。之后，无法再启动NFS客户端服务进程，只能重启。
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本帖最后由 linda 于 2021-3-5 12:14 编辑 ]
