RE: Problem converting data raid0 to raid1: enospc errors during balance

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I actually tried going to raid1 with kernel 3.10 before....the reason I updated to 3.17 was to see if this would fix the error. 

It still remained though....


----------------------------------------
> Subject: Re: Problem converting data raid0 to raid1: enospc errors during balance
> From: lists@xxxxxxxxxxxxxxxxx
> Date: Mon, 27 Oct 2014 10:43:41 -0600
> CC: quwenruo@xxxxxxxxxxxxxx; linux-btrfs@xxxxxxxxxxxxxxx
> To: jverberk@xxxxxxxxxxx
>
>
> On Oct 27, 2014, at 9:56 AM, Jasper Verberk <jverberk@xxxxxxxxxxx> wrote:
>
>> These are the results to a normal df:
>>
>> http://paste.debian.net/128932/
>>
>> The mountpoint is /data.
>
> OK so this is with the new computation in kernel 3.17 (which I think contains a bug by counting free space twice); so now it shows available blocks based on the loss due to mirroring or parity. So 1k blocks 5860533168 = 5.45TiB. If you boot an older kernel my expectation is this shows up as 10.91TiB. In any case, df says there's 1.77TiB worth of data, so there should be plenty of space.
>
> Somewhere there's a bug. Either the 'btrfs fi df' is insufficiently communicating whether the desired operation can be done, or there's actual kernel confusion on how much space is available to do the conversion.
>
> I wonder what happens if you go back to kernel 3.16 and try do do the conversion?
>
>
> Chris Murphy--
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