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
<donaldwhpear...@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 <rraue...@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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