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Subject: Re: Phantom full ext4 root filesystems on 4.1 through 4.14 kernels
To: Elana Hashman <Elana.Hashman@twosigma.com>,
        "'tytso@mit.edu'" <tytso@mit.edu>
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From: Reindl Harald <h.reindl@thelounge.net>
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Date: Thu, 8 Nov 2018 19:13:36 +0100
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Am 08.11.18 um 18:59 schrieb Elana Hashman:
> After a reboot, `df` reflects real utilization:
> 
> $ df -h /
> Filesystem                                              Size  Used Avail Use% Mounted on
> /dev/disk/by-uuid/<some-uuid>   50G   16G   31G  34% /
> 
> We are using overlay2fs for Docker, as well as rbd mounts; I'm not sure how they might interact.

and what says "df -hi"?
maybe you are running simply out of inodes