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Date: Sun, 10 Jan 2016 17:24:37 -0700
Message-ID: <CAJCQCtSuCj2tWfgKaGOYRP57LURaQv4jXdkJW6cjqjdVEvHTxw@mail.gmail.com>
Subject: Re: 6TB partition, Data only 2TB - aka When you haven't hit the
 "usual" problem
From: Chris Murphy <lists@colorremedies.com>
To: "cheater00 ." <cheater00@gmail.com>
Cc: Henk Slager <eye1tm@gmail.com>, Btrfs BTRFS <linux-btrfs@vger.kernel.org>,
        Hugo Mills <hugo@carfax.org.uk>,
        Chris Murphy <lists@colorremedies.com>
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Sender: linux-btrfs-owner@vger.kernel.org
List-ID: <linux-btrfs.vger.kernel.org>

On Sun, Jan 10, 2016 at 4:47 PM, cheater00 . <cheater00@gmail.com> wrote:
> On Sun, Jan 10, 2016 at 3:14 PM, Henk Slager <eye1tm@gmail.com> wrote:

> buggy fs ("Media"):
> Data, single: total=1.98TiB, used=1.98TiB
> System, DUP: total=8.00MiB, used=240.00KiB
> System, single: total=4.00MiB, used=0.00B
> Metadata, DUP: total=5.50GiB, used=3.49GiB
> Metadata, single: total=8.00MiB, used=0.00B
> GlobalReserve, single: total=512.00MiB, used=0.00B
>
>> What you could try is to create an image+'copy' of the fs with
>> btrfs-image just after you get ENOSPC abd then do various tests with
>> that (make sure unmount or even better unplug the physical hdd!). Like
>> mounting and then try to add a file, convert all metadata + system
>> from dup to single and then try to add a file. It all doesn't give
>> real space, but it might give hints to what could be wrong.
>
> I can't do that because I would have to buy an extra disk which is 300 euro.

You have 4TB unused on that disk. You could shrink the fs to ~3TB, and
then change partition size to match and create a 2nd partition with
whatever FS you want as the target for btrfs-image.

After that, migrate your data from the broken fs to the new one. If
you use Btrfs for the new volume on that 2nd partition you can use
btrfs send-receive for this. After it's successful, you can wipefs the
1st partition, and then add it as an additional device to the new
volume.

-- 
Chris Murphy