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Date: Thu, 27 Apr 2017 19:07:51 +0500
From: Roman Mamedov <rm@romanrm.net>
To: Gerard Saraber <gsaraber@rarcoa.com>
Cc: linux-btrfs@vger.kernel.org
Subject: Re: No space left on device when doing "mkdir"
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On Thu, 27 Apr 2017 08:52:30 -0500
Gerard Saraber <gsaraber@rarcoa.com> wrote:

> I could just reboot the system and be fine for a week or so, but is
> there any way to diagnose this?

`btrfs fi df` for a start.

Also obligatory questions: do you have a lot of snapshots, and do you use
qgroups?

-- 
With respect,
Roman