MacOS 升级到 Big Sur 之后，原先可以mount的NFS突然报错：
mount_nfs: can't mount with remote locks when server (192.168.3.234) is not running rpc.statd: RPC prog. not avail
mount: /Users/simonliu/nas/video failed with 74
解决方案1
使用nolocks参数即可
sudo mount -o nolocks,rw -t nfs 192.168.3.234:/e/video/ /Users/simonliu/nas/video/
或者更多的参数：
sudo mount -o nolocks,resvport,locallocks -t nfs 192.168.3.234:/e/video/ /Users/simonliu/nas/video/
解决方案2
让macOS使用NFS V4
编辑/etc/nfs.conf，添加如下内容
nfs.client.mount.options = vers=4
参考文献：
Since upgrading to Big Sur, i can not longer mount remote nfs drives
nfs mount/automount fails on Big Sur - Apple Community