I'm using the USB backup plugin and experiencing quite a strange behavior. I plugin the usb drive. As expected it gets mounted as "/srv/dev-disk-by-id-ata-WDC_WD40EZRZ-00WN9B0_WD-WCC4E7CKHX15-part1" and backup starts.
Have a look into the syslog, it says "systemd-aee38e127d149e5f0bfa440ad98b5fd9[7654]: Please wait, syncing....". Hmm? Usually it's labeled with the id like "systemd-WDC_WD40EZRZ-00WN9B0_WD-WCC4E7CKHX15-part1"? Not sure about that.
Output of lsblk is
NAME MAJ:MIN RM SIZE RO TYPE MOUNTPOINT
....
sdc 8:32 0 3.7T 0 disk
└─sdc1 8:33 0 3.7T 0 part /srv/dev-disk-by-id-ata-WDC_WD40EZRZ-00WN9B0_WD-WCC4E7CKHX15-part1
After the backup has finished it tries to unmount the disk but not successfully. Syslog says "systemd-aee38e127d149e5f0bfa440ad98b5fd9[7654]: rmdir: failed to remove '/srv/aee38e127d149e5f0bfa440ad98b5fd9/': Device or resource busy". I think hmm? What actually is /srv/aee38e127d149e5f0bfa440ad98b5fd9/? My drive is /srv/dev-disk-by-id-ata-WDC_WD40EZRZ-00WN9B0_WD-WCC4E7CKHX15-part1...
Output of lsblk is now
NAME MAJ:MIN RM SIZE RO TYPE MOUNTPOINT
....
sdc 8:32 0 3.7T 0 disk
└─sdc1 8:33 0 3.7T 0 part /srv/aee38e127d149e5f0bfa440ad98b5fd9
What is happening here? In /srv I can see both directories
drwxr-xr-x 8 root root 4096 Oct 28 23:33 aee38e127d149e5f0bfa440ad98b5fd9
drwxr-xr-x 2 root root 4096 Oct 29 12:45 dev-disk-by-id-ata-WDC_WD40EZRZ-00WN9B0_WD-WCC4E7CKHX15-part1
When I go to OMV Filesystems tab I can unmount manually but both still exist in /srv.. Actually I assume they should not be there anymore after unmounting? When I mount and unmount again using OMV menu, at least dev-disk-by-id-ata-WDC_WD40EZRZ-00WN9B0_WD-WCC4E7CKHX15-part1 is gone but aee38e127d149e5f0bfa440ad98b5fd9 is still existing in /srv.
Is that a known bug or am I missing something?