I have a fileserver with several HDDs (btrfs and dm-crypt for all except
one which is lvm2 and dm-crypt).
Within the last week when I umount a USB drive, all my other mounts
immediately get unmounted too. I lose /home and almost everything else
except the system device. The USB drive is the ESP (EFI system partition)
mounted at /boot. It is intended to be unmounted after boot and it worked
appropriately until the last week.
If I reboot, all is fine until I umount the USB device (ESP).
I have *not* tried to reproduce the behavior by umounting other devices as
this is a live fileserver. However, I can trigger this behavior 100% of the
time if I umount /boot.
journalctl shows a number of messages similar to this:
Jul 24 20:25:41 myserver systemd[1]: Stopped (with error)
/dev/mapper/wxyz.
-- Subject: Unit dev-mapper-wxyz.device has finished shutting down
-- Defined-By: systemd
-- Support: http://lists.freedesktop.org/mailman/listinfo/systemd-devel
--
-- Unit dev-mapper-wxyz.device has finished shutting down.
As I said, the system has started, in the last week, unmounting all these
other devices. Why?
I am not a developer and I am new to systemd. I am happy to provide
additional information upon request.
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