[arch-general] can't balance full btrfs raid6 filesystem

Alistair Grant akgrant0710 at gmail.com
Sat Feb 20 13:04:01 UTC 2016

On 20 February 2016 at 02:38, Jameson Pugh <imntreal at gmail.com> wrote:
> I have a raid6 btrfs filesystem which I filled up, and added a disk to:
>> sudo btrfs fi show /dev/sdb
> Label: 'raid'  uuid: 96c75e11-ab60-44b6-a450-4cd2831f86f0
>        Total devices 5 FS bytes used 917.77GiB
>        devid    1 size 465.76GiB used 465.76GiB path /dev/sdb
>        devid    2 size 465.76GiB used 465.76GiB path /dev/sdc
>        devid    3 size 465.76GiB used 465.76GiB path /dev/sdd
>        devid    4 size 931.51GiB used 465.76GiB path /dev/sde
>        devid    5 size 1.82TiB used 0.00B path /dev/sdf
> Despite having removed files, and added the new device, I still can't
> balance the filesystem:
> ...

Did you do it in that order?  How about attempting to remove files
after adding the new device.

As Guus said, removing a snapshot is more likely to help than removing files.

If you haven't already done so, I'd also suggest posting this to the
linux-btrfs mailing list (see


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