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

[Garmine 42]

On 22 February 2016 at 17:22, Jameson <imntreal at gmail.com> wrote:
> On Sun, Feb 21, 2016 at 6:36 AM Guus Snijders <gsnijders at gmail.com> wrote:
>
>> Op 20 feb. 2016 16:06 schreef "Jameson Pugh" <imntreal at gmail.com>:
>> >
>> >
>> >
>> > On Sat, Feb 20, 2016 at 8:04 AM, Alistair Grant <akgrant0710 at gmail.com>
>> wrote:
>> >>
>> >> 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:
>> [...]
>>
>> >> If you haven't already done so, I'd also suggest posting this to the
>> >> linux-btrfs mailing list (see
>> >> https://btrfs.wiki.kernel.org/index.php/Btrfs_mailing_list)
>> >
>> >
>> > Yes. I've tried removing files after adding the device. Unfortunately,
>> there are no snapshots. I could try removing subvolumes. I'll try the btrfs
>> list.
>>
>> Out of  pure curiosity I took a quick look at the archives of that list and
>> it looked quite promising (though i'm not sure if it was the same OP).
>>
>> If it works, could you post here also? I have a feeling you won't be the
>> last person to run into this situation.
>>
>
> Removing subvolumes, and clobbering files didn't help, so I wound up
> starting over. The first thing I did was create a base subvolume, and then
> added a quota to it before creating subvolumes nested under it. Hopefully,
> this will help. Unfortunately, with the way btrfs reports free space, it
> will still be challenge to manage.
>
> Thanks,
> Jameson

Hi!

You should not use quotas on btrfs currently. It is known to cause
significant performance issues on the long run (and potentially has
many undiscovered bugs). If you wish I can dig up the relevant
discussion on the btrfs mailing list for you.

Regards,
Garmine