Yes -- I just figured that out as well!
Now why did it suddenly fill up? (I still get the failure rebalancing ...)
# btrfs fi show /
Label: 'centos7' uuid: 35f0ce3f-0902-47a3-8ad8-86179d1f3e3a
Total devices 4 FS bytes used 17.12GiB
devid 1 size 111.11GiB used 111.05GiB path /dev/sdf3
devid 2 size 111.11GiB used 111.05GiB path /dev/sdg3
devid 3 size 5.00GiB used 5.00GiB path /dev/loop1
devid 4 size 5.00GiB used 5.00GiB path /dev/loop2
Btrfs v3.16.2
On Thu, Jul 2, 2015 at 11:01 PM, Donald Pearson
<donaldwhpearson@xxxxxxxxx> wrote:
> 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@xxxxxxxxx> 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@xxxxxxxxx> 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@xxxxxxxxx> 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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