William Morder composed on 2018-03-19 20:00 (UTC-0700):
Nick Koretsky wrote:
Well, i mean does reboot reclaim that lost space? You see one of a possible reason for a "vanished" space are open deleted files. If some daemon misbehave with cache or imporper log rotations, etc...
It does reclaim some of the lost space, yes - hence one reason for rebooting, when I run out of space - but there is still a creeping issue of space disappearing in increments of a couple mb at a time.
Maybe a look at /etc/fstab and output from mount | egrep -v "cgroup|rpc|tmpfs|^sys|on /dev|on /proc|on /sys|on /var" | sort would help us help you.