On Tue, Sep 20, 2016 at 03:47:14PM +0900, Tomasz Chmielewski wrote:
> How to understand the following "btrfs fi show" output?

This gives a write-up (and worked example) of an answer to your question:

https://btrfs.wiki.kernel.org/index.php/FAQ#Understanding_free_space.2C_using_the_original_tools

   If you've got any follow-up questions after reading it, please do
come back and we can try to improve the FAQ entry. :)

   Hugo.

> # btrfs fi show /var/lib/lxd
> Label: 'btrfs'  uuid: f5f30428-ec5b-4497-82de-6e20065e6f61
>         Total devices 2 FS bytes used 136.18GiB
>         devid    1 size 423.13GiB used 423.13GiB path /dev/sda3
>         devid    2 size 423.13GiB used 423.13GiB path /dev/sdb3
> 
> Why is it "size 423.13GiB used 423.13GiB"? Is it full?
> 
> I had "No space left" on this filesystem just yesterday (running
> kernel 4.7.4). This is btrfs RAID-1 on SSD disks. This filesystem is
> used for 20-30 LXD containers with different roles (mongo, mysql,
> postgres databases, webservers etc.), around 150 read-only
> snapshots, btrfs compression is disabled.
> 
> 
> Both "btrfs fi df" and "df -h" show plenty of space:
> 
> # btrfs fi df /var/lib/lxd
> Data, RAID1: total=417.12GiB, used=131.33GiB
> System, RAID1: total=8.00MiB, used=80.00KiB
> Metadata, RAID1: total=6.00GiB, used=4.86GiB
> GlobalReserve, single: total=512.00MiB, used=0.00B
> 
> 
> # df -h
> Filesystem      Size  Used Avail Use% Mounted on
> /dev/sda3       424G  137G  286G  33% /var/lib/lxd
> 
> 
> 
> Tomasz Chmielewski
> https://lxadm.com
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-- 
Hugo Mills             | I can resist everything except temptation.
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PGP: E2AB1DE4          |

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