Is my btrfs full?

Is my btrfs full?

[Petr Tichý]

Hello everybody,

I have a 130 GB btrfs with rsnapshot-like backups mounted with compressoin=zlib and now I'm getting ENOSPC, while df shows only some 60 % used. I'm running Linux version 3.2.0-3-amd64 (Debian 3.2.23-1). Is my btrfs really full? Will a more recent kernel solve this?

root@roura:~# btrfs filesystem show --all-devices
Label: none  uuid: 12880174-8337-47bc-be05-f485a0b7503f
	Total devices 1 FS bytes used 72.67GB
	devid    1 size 130.00GB used 130.00GB path /dev/sdd

root@roura:~# btrfsck /dev/sdd
checking extents
checking fs roots
checking root refs
found 78034288640 bytes used err is 0
total csum bytes: 72765720
total tree bytes: 3521994752
total fs tree bytes: 3242008576
btree space waste bytes: 476621556
file data blocks allocated: 74512293888
 referenced 107630747648
Btrfs Btrfs v0.19

Thanks

Petr

Re: Is my btrfs full?

[Hugo Mills]

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On Tue, Sep 04, 2012 at 06:07:50PM +0200, Petr Tichý wrote:
> I have a 130 GB btrfs with rsnapshot-like backups mounted with
> compressoin=zlib and now I'm getting ENOSPC, while df shows only
> some 60 % used. I'm running Linux version 3.2.0-3-amd64 (Debian
> 3.2.23-1). Is my btrfs really full? Will a more recent kernel solve
> this?

   We strongly recommend using the latest available kernel (currently
3.5 or 3.6-rc4) if you're running btrfs. The code is still moving very
quickly, and the main devs are still finding and fixing fairly serious
bugs.

> root@roura:~# btrfs filesystem show --all-devices
> Label: none  uuid: 12880174-8337-47bc-be05-f485a0b7503f
> 	Total devices 1 FS bytes used 72.67GB
> 	devid    1 size 130.00GB used 130.00GB path /dev/sdd

   You may want to read about df[1], and then about ENOSPC errors[2].

   If you've still got questions after that, please do come back and
ask them.

   Hugo.

[1] https://btrfs.wiki.kernel.org/index.php/FAQ#Why_does_df_show_incorrect_free_space_for_my_RAID_volume.3F
[2] https://btrfs.wiki.kernel.org/index.php/Problem_FAQ#I_get_.22No_space_left_on_device.22_errors.2C_but_df_says_I.27ve_got_lots_of_space

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