Hello everyone, recently I ran into a problem. When I check the /mnt/user/domain directory, I find that the virtual machine directories I deleted before (such as "DM") are still there.

I tried to use the rm -r DM command to delete it, but it prompted me device or resource busy . After checking multiple times, I found through mount | grep DM that Unraid mounted vdisk1.img under the DM directory at cache/domains/DM/vdisk1.img, which caused me to be unable to delete it.

After I used umount /mnt/user/domains/DM/vdisk1.img to unmount it, I was able to delete the DM folder. Just when I thought the problem was solved, I found that once I restarted the array, unraid would automatically create the /mnt/user/domains/DM directory and /mnt/user/domains/DM/vdisk1.img file, and continue to mount it at the original location, even though I had already deleted the DM VM. I checked the files under boot, but couldn't find how to delete the mount settings.

After using unraid, I created 8 virtual machines and deleted them all, and 4 of the virtual machines had the above situation. I want to ask what caused this situation?

Thanks for everyone's help!

Is that folder a ZFS dataset?

Just now, trurl said:

Is that folder a ZFS dataset?

Yes, the domains folder is on a ZFS-based file system

Post the output from zfs list -t all

4 minutes ago, JorgeB said:

Post the output from zfs list -t all

Thanks a lot for help.

zfs list -t all

NAME                             USED  AVAIL  REFER  MOUNTPOINT

cache                            331G  2.23T  71.4M  /mnt/cache

cache/Code                       215K  2.23T   215K  /mnt/cache/Code

cache/Photos                     293M  2.23T   293M  /mnt/cache/Photos

cache/Public                    4.25G  2.23T  4.25G  /mnt/cache/Public

cache/Videos                     163K  2.23T   163K  /mnt/cache/Videos

cache/appdata                    204G  2.23T   204G  /mnt/cache/appdata

cache/domains                   51.6G  2.23T  24.4G  /mnt/cache/domains

cache/domains/Debian             140K  2.23T   140K  /mnt/cache/domains/Debian

cache/domains/DownloadMachine    140K  2.23T   140K  /mnt/cache/domains/DownloadMachine

cache/domains/DownloadMachineD  9.44G  2.23T  9.44G  /mnt/cache/domains/DownloadMachineD

cache/domains/GameMachine        140K  2.23T   140K  /mnt/cache/domains/GameMachine

cache/domains/GameServer        17.7G  2.23T  17.7G  /mnt/cache/domains/GameServer

cache/isos                      13.8G  2.23T  13.8G  /mnt/cache/isos

cache/system                    57.1G  2.23T  57.1G  /mnt/cache/system

cache/domains/Debian cache/domains/DownloadMachine  etc. are the virtual machine directories mentioned above.

They are zfs datasets, you need to use zfs destroy, e.g.:

zfs destroy cache/domains/DownloadMachine

If there are snapshots or clones, you will need to use -r or -R, it will tell you when runing the command above.

20 minutes ago, JorgeB said:

They are zfs datasets, you need to use zfs destroy, e.g.:

zfs destroy cache/domains/DownloadMachine

If there are snapshots or clones, you will need to use -r or -R, it will tell you when runing the command above.

All right, thank you!