On 4/7/2025 2:09 PM, TSS wrote:
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. Also, fuser -c shows no usage of the drive. Restarting or
turning off hotplugd doesn't free up the drive for unmounting either. Is
there some other reason why the drive would remain in use that I could
investigate?
Thanks for any suggestions,
--T
I've not used hotplugd, but does the script to a "cd <mounted usb backup
drive>"? If so, at the end of the script, change directory back to
something not on the usb device. That's a real confusing thing, if the
script perhaps hangs around. I know I've been annoyed to find a second
terminal or virtual console open where I changed into a folder then
switched screens (forgot) and couldn't umount a device.
Good luck!
Cheers,
Steve W.
