Raspberry Pi 3 用作 NAS 时“设备上没有剩余空间”

Question

我有一个用作 NAS 的 Raspberry Pi 3，带有 USB LUKS 加密驱动器和 SMB。当我尝试复制时，我得到：

$ cp -r /media/pi/Backup/Backups/_altii/Daniel/ /media/pi/share/
cp: eroare la scrierea '/media/pi/share/Daniel/poze 2012-27 aprilie 2021/1614357450431.JPG': No space left on device

用英语说cp: error writing '/media/pi/share/Daniel/poze 2012-27 aprilie 2021/1614357450431.JPG': No space left on device

df -h显示剩余 720GB：

$ df -h /dev/dm-0
Sistem de fișiere                                     Dimens Utilizat Liber  Uz% Montat pe
/dev/mapper/luks-b8ddc005-ebe8-4219-8ae4-6eae54159a6b   1,8T     978G  720G  58% /media/pi/Backup

du -sh显示零：

$ du -sh /dev/dm-0
0   /dev/dm-0

有空闲的索引节点：

$ df -i /dev/dm-0
Sistem de fișiere                                       Inoduri IUtilizat    ILiber IUz% Montat pe
/dev/mapper/luks-b8ddc005-ebe8-4219-8ae4-6eae54159a6b 119046144   2562741 116483403   3% /media/pi/Backup

并且没有打开已删除的文件：

pi@raspberrypi:/media/pi/share $ lsof | grep deleted
pi@raspberrypi:/media/pi/share $ 
pi@raspberrypi:/media/pi/share $ lsof /dev/dm-0 | grep deleted
pi@raspberrypi:/media/pi/share $