TSS <t...@mg-1.uk> writes: > Greetings, > > I've been using this gimmick for backing up some OpenBSD 7.6 systems: > https://github.com/thexhr/openbsd-timemachine > For the purposes of this discussion, it: > > 1. uses hotplugd to run a script when you plug in a USB backup drive > 2. this script mounts the backup drive > 3. it then uses rsnapshot (rsync basically) to back up the data > 4. the script unmounts the backup drive > > Everything is just fine until step 4, when the backup drive refuses to > unmount. If you try to do it yourself, you see: > > umount: /my_backup_mount_point: Device busy > > This doesn't seem to be a temporary issue: after an hour's wait, the drive > still can't be unmounted. > > I'm not sure how to debug the problem since fstat shows no open file on the > drive, nor any process using any directory on the drive as a working > directory.
how did you use fstat ? I don't remember well, but using 'fstat /my_backup_mount_point' might not be enough. but you could use: $ fstat -f /my_backup_mount_point with -f, fstat will list all opened files in the /my_backup_mount_point mount point (at any depth). (it should be the same than 'fstat | grep /my_backup_mount_point') Regards. -- Sebastien Marie
