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.
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