Re: btrfs full, but not full, can't rebalance

[Donald Pearson <donaldwhpearson@gmail.com>]

Because this is raid1 I believe you need another for that to work.

On Fri, Jul 3, 2015 at 12:57 AM, Rich Rauenzahn <rrauenza@gmail.com> wrote:
> Yes, I tried that -- and adding the loopback device.
>
> # btrfs device add /dev/loop1 /
> Performing full device TRIM (5.00GiB) ...
>
> # btrfs fi show /
> Label: 'centos7'  uuid: 35f0ce3f-0902-47a3-8ad8-86179d1f3e3a
>         Total devices 3 FS bytes used 17.13GiB
>         devid    1 size 111.11GiB used 111.10GiB path /dev/sdf3
>         devid    2 size 111.11GiB used 111.10GiB path /dev/sdg3
>         devid    3 size 5.00GiB used 0.00 path /dev/loop1
>
> Btrfs v3.16.2
>
> # btrfs balance start -m /
> ERROR: error during balancing '/' - No space left on device
> There may be more info in syslog - try dmesg | tail
>
> # btrfs balance start -v -dusage=1 /
> Dumping filters: flags 0x1, state 0x0, force is off
>   DATA (flags 0x2): balancing, usage=1
> ERROR: error during balancing '/' - No space left on device
> There may be more info in syslog - try dmesg | tail
>
>
>
> On Thu, Jul 2, 2015 at 10:45 PM, Donald Pearson
> <donaldwhpearson@gmail.com> wrote:
>> Have you seen this article?
>>
>> I think the interesting part for you is the "balance cannot run
>> because the filesystem is full" heading.
>>
>> http://marc.merlins.org/perso/btrfs/post_2014-05-04_Fixing-Btrfs-Filesystem-Full-Problems.html
>>
>> On Fri, Jul 3, 2015 at 12:32 AM, Rich Rauenzahn <rrauenza@gmail.com> wrote:
>>> Running on CentOS7 ... / got full, I removed the files, but it still
>>> thinks it is full.  I've tried following the FAQ, even adding a
>>> loopback device during the rebalance.
>>>
>>> # btrfs fi show /
>>> Label: 'centos7'  uuid: 35f0ce3f-0902-47a3-8ad8-86179d1f3e3a
>>>         Total devices 2 FS bytes used 24.27GiB
>>>         devid    1 size 111.11GiB used 111.05GiB path /dev/sdf3
>>>         devid    2 size 111.11GiB used 111.05GiB path /dev/sdg3
>>>
>>> # btrfs fi df /
>>> Data, RAID1: total=107.02GiB, used=22.12GiB
>>> System, RAID1: total=32.00MiB, used=16.00KiB
>>> Metadata, RAID1: total=4.05GiB, used=2.15GiB
>>> GlobalReserve, single: total=512.00MiB, used=0.00
>>>
>>> # btrfs balance start -v -dusage=1 /
>>> Dumping filters: flags 0x1, state 0x0, force is off
>>>   DATA (flags 0x2): balancing, usage=1
>>> ERROR: error during balancing '/' - No space left on device
>>> There may be more info in syslog - try dmesg | tail
>>>
>>> # btrfs balance start -m /
>>> ERROR: error during balancing '/' - No space left on device
>>> There may be more info in syslog - try dmesg | tail
>>>
>>> What can I do?
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