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Synology Docker UrBackup can't delete folder => Operation not permitted

on a DS415+ I installed the Docker package and ran UrBackup. Since the disk space on Volume1 was running low, I copied Docker and UrBackup to Volume2.

Then I deleted all Docker and UrBackup files on Volume1.

But I can't delete the /volume1/docker/urbackup/testA54hj5luZtlorr494/A folder.

I've already tried:

# chmod 777 A/
# chown root:root A/
# lsattr 
---------------- ./A
# sudo rm -r /A
rm: cannot remove ‘A/’: Operation not permitted

Now my shell knowledge is at an end and googling has not helped me any more.

I hope for your tips to get my system clean again.

Thx Max

Solution

  • Learned something again:

    Directory A cannot be deleted because it is not a directory.

    It's a btrfs subvolume It can be deleted with

    # sudo btrfs subvolume delete /volume1/docker/urbackup/testA54hj5luZtlorr494/A

    first i got the error

    ERROR: cannot delete '/volume1/docker/urbackup/testA54hj5luZtlorr494/A': Device or resource busy

    This could be avoided by stopping the container.

    Maybe it will help someone ...