Donald and I went offline so I will summarize where I am now:
(1) Since I'm RAID1, I had to add two loopbacks. That makes sense!
(2) The two 5GB loopbacks filled up almost instantly and did me no good.
(3) I created two more 100 GB loopbacks (hint: use /usr/bin/truncate
not /usr/bin/dd to create the empty files!)
I then was able to make some progress with balancing with -dusage=1.
I went to -dusage=2 and it failed with enospc again. A little while
later -dusage=2 worked. I believe I made it up to -dusage=5 and then
higher values failed.
At this point I saw that my 'btrfs fi show' showed that I had some
headroom, so I dropped all of the loopbacks from my volume.
But I found that I still could not "touch /tmp/foo".
I then just tried running btrfs balance start. I noticed in dmesg
that although btrfs balance was exiting with an error about space, it
was making progress on some extents. btrfs fi show also reflected
that. So I began a loop...
while ! btrfs balance start /; do btrfs fi show /; btrfs fi df / ; done
It is still running, but after a few iterations I am now able to touch
a file /tmp/foo successfully and the fi show seems to still be coming
down to a proper value, although occasionally it bumps up the wrong
direction:
]# while ! btrfs balance start /; do btrfs fi show /; btrfs fi df / ; done
ERROR: error during balancing '/' - No space left on device
There may be more info in syslog - try dmesg | tail
Label: 'centos7' uuid: 35f0ce3f-0902-47a3-8ad8-86179d1f3e3a
Total devices 2 FS bytes used 17.25GiB
devid 1 size 111.11GiB used 84.03GiB path /dev/sdf3
devid 2 size 111.11GiB used 84.03GiB path /dev/sdg3
Btrfs v3.16.2
Data, RAID1: total=41.00GiB, used=16.54GiB
System, RAID1: total=32.00MiB, used=16.00KiB
Metadata, RAID1: total=43.00GiB, used=724.38MiB
GlobalReserve, single: total=256.00MiB, used=336.00KiB
ERROR: error during balancing '/' - No space left on device
There may be more info in syslog - try dmesg | tail
Label: 'centos7' uuid: 35f0ce3f-0902-47a3-8ad8-86179d1f3e3a
Total devices 2 FS bytes used 17.25GiB
devid 1 size 111.11GiB used 85.03GiB path /dev/sdf3
devid 2 size 111.11GiB used 85.03GiB path /dev/sdg3
Btrfs v3.16.2
Data, RAID1: total=40.00GiB, used=16.54GiB
System, RAID1: total=32.00MiB, used=16.00KiB
Metadata, RAID1: total=45.00GiB, used=724.30MiB
GlobalReserve, single: total=256.00MiB, used=256.00KiB
ERROR: error during balancing '/' - No space left on device
There may be more info in syslog - try dmesg | tail
Label: 'centos7' uuid: 35f0ce3f-0902-47a3-8ad8-86179d1f3e3a
Total devices 2 FS bytes used 17.25GiB
devid 1 size 111.11GiB used 86.03GiB path /dev/sdf3
devid 2 size 111.11GiB used 86.03GiB path /dev/sdg3
Btrfs v3.16.2
Data, RAID1: total=39.00GiB, used=16.54GiB
System, RAID1: total=32.00MiB, used=16.00KiB
Metadata, RAID1: total=47.00GiB, used=723.78MiB
GlobalReserve, single: total=256.00MiB, used=272.00KiB
Many thanks to Donald for getting me to this point!
On Thu, Jul 2, 2015 at 10:57 PM, Rich Rauenzahn <rraue...@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
> <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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