I didn't notice this until it was nearly too late. I had run out of
metadata space so I ran
btrfs balance start -v -dusage=0 /mnt/btrfsroot
That went fine, but I was still low on metadata space, so I tried a
few variations:
btrfs balance start -v -dusage=1 /mnt/btrfsroot
btrfs balance start -v -dusage=5 /mnt/btrfsroot
btrfs balance start -v -dusage=10 /mnt/btrfsroot
I didn't run any of these to completion, I cancelled them after a few hours.
I captured the output of a couple commands every once in a while:
btrfs fi df /mnt/btrfsroot
btrfs fi show /dev/sda5
What I didn't notice (because I was looking at the metadata space) was
the Data total size.
It starts out as:
Data, single: total=4.61TiB, used=2.50TiB
System, DUP: total=8.00MiB, used=576.00KiB
System, single: total=4.00MiB, used=0.00
Metadata, DUP: total=46.50GiB, used=42.82GiB
Metadata, single: total=8.00MiB, used=0.00
unknown, single: total=512.00MiB, used=0.00
Label: none uuid: e6818780-7d28-41fe-b7a8-e38b61a98621
Total devices 1 FS bytes used 2.54TiB
devid 1 size 5.35TiB used 4.70TiB path /dev/sda5
Over time however, the Data total begins to drop:
Data, single: total=4.56TiB, used=2.50TiB
Data, single: total=4.41TiB, used=2.50TiB
Data, single: total=4.23TiB, used=2.51TiB
Data, single: total=4.00TiB, used=2.51TiB
Data, single: total=3.59TiB, used=2.51TiB
Data, single: total=3.35TiB, used=2.51TiB
The drop corresponds to a drop in the "show" used amounts:
devid 1 size 5.35TiB used 4.65TiB path /dev/sda5
devid 1 size 5.35TiB used 4.50TiB path /dev/sda5
devid 1 size 5.35TiB used 4.32TiB path /dev/sda5
devid 1 size 5.35TiB used 4.09TiB path /dev/sda5
devid 1 size 5.35TiB used 3.68TiB path /dev/sda5
devid 1 size 5.35TiB used 3.44TiB path /dev/sda5
System info:
Ubuntu 14.04
Linux server4 4.4.0-38-generic #57~14.04.1-Ubuntu SMP Tue Sep 6
17:20:43 UTC 2016 x86_64 x86_64 x86_64 GNU/Linux
I had been running the 14.04 btrfs-progs version 3.12-1ubuntu0.1
I just upgraded to btrfs-progs 4.4.1~ubuntu14.04.1~ppa1 from a PPA,
which allowed me to run
# btrfs fi usage /mnt/btrfsroot/
Overall:
Device size: 5.35TiB
Device allocated: 3.44TiB
Device unallocated: 1.91TiB
Device missing: 0.00B
Used: 2.59TiB
Free (estimated): 2.75TiB (min: 1.80TiB)
Data ratio: 1.00
Metadata ratio: 2.00
Global reserve: 512.00MiB (used: 0.00B)
Data,single: Size:3.35TiB, Used:2.51TiB
/dev/sda5 3.35TiB
Metadata,DUP: Size:46.50GiB, Used:42.07GiB
/dev/sda5 93.00GiB
System,DUP: Size:32.00MiB, Used:416.00KiB
/dev/sda5 64.00MiB
Unallocated:
/dev/sda5 1.91TiB
Any suggestions?
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