Dāvis Mosāns wrote on 2016/03/03 02:28 +0200:
2016-02-27 23:14 GMT+02:00 Marc Haber <mh+linux-bt...@zugschlus.de>:
Hi,
I have again the issue of no space left on device while rebalancing
(with btrfs-tools 4.4.1 on kernel 4.4.2 on Debian unstable):
I've same issue, 4.4.3 kernel on Arch Linux
$ sudo btrfs fi show /mnt/fs/
Label: 'fs' uuid: a3c66d25-2c25-40e5-a827-5f7e5208e235
Total devices 1 FS bytes used 396.94GiB
devid 1 size 435.76GiB used 435.76GiB path /dev/sdi2
$ sudo btrfs fi df /mnt/fs/
Data, single: total=416.70GiB, used=390.62GiB
System, DUP: total=32.00MiB, used=96.00KiB
Metadata, DUP: total=9.50GiB, used=6.32GiB
GlobalReserve, single: total=512.00MiB, used=0.00B
$ sudo btrfs fi usage /mnt/fs/
Overall:
Device size: 435.76GiB
Device allocated: 435.76GiB
Device unallocated: 1.00MiB
Not quite the same with the problem with OP.
In your case, only 1M is not allocated, which is below minimal chunk
size 16M.
So, you're really out of unallocated space.
Device missing: 0.00B
Used: 403.26GiB
Free (estimated): 26.07GiB (min: 26.07GiB)
Data ratio: 1.00
Metadata ratio: 2.00
Global reserve: 512.00MiB (used: 0.00B)
Data,single: Size:416.70GiB, Used:390.62GiB
/dev/sdi2 416.70GiB
Metadata,DUP: Size:9.50GiB, Used:6.32GiB
/dev/sdi2 19.00GiB
But considering your space usage, I didn't see any need to balance though.
You have over 3G metadata space, and about 20G data.
No obvious meta/data unbalance.
System,DUP: Size:32.00MiB, Used:96.00KiB
/dev/sdi2 64.00MiB
Unallocated:
/dev/sdi2 1.00MiB
$ sudo btrfs balance start -v /mnt/fs/
Dumping filters: flags 0x7, state 0x0, force is off
DATA (flags 0x0): balancing
METADATA (flags 0x0): balancing
SYSTEM (flags 0x0): balancing
ERROR: error during balancing '/mnt/fs/': No space left on device
There may be more info in syslog - try dmesg | tail
$ sudo btrfs balance start -dusage=34 /mnt/fs/
Done, had to relocate 0 out of 438 chunks
$ sudo btrfs balance start -dusage=35 /mnt/fs/
ERROR: error during balancing '/mnt/fs/': No space left on device
$ sudo btrfs balance start -musage=0 /mnt/fs/
Done, had to relocate 0 out of 438 chunks
$ sudo btrfs balance start -musage=1 /mnt/fs/
ERROR: error during balancing '/mnt/fs/': No space left on device
$ sudo btrfs balance start -dprofiles=single /mnt/fs
ERROR: error during balancing '/mnt/fs': No space left on device
$ sudo btrfs balance start -mprofiles=dup /mnt/fs
Done, had to relocate 20 out of 438 chunks
$ sudo btrfs balance start -sprofiles=dup --force /mnt/fs
Done, had to relocate 1 out of 433 chunks
$ sudo btrfs fi df /mnt/fs/
Data, single: total=416.70GiB, used=390.62GiB
System, DUP: total=32.00MiB, used=96.00KiB
Metadata, DUP: total=7.00GiB, used=6.31GiB
GlobalReserve, single: total=512.00MiB, used=0.00B
$ sudo btrfs fi usage /mnt/fs/
Overall:
Device size: 435.76GiB
Device allocated: 430.76GiB
Device unallocated: 5.00GiB
After balancing data and metadata, you have space for at least 5 chunks.
So you should be OK to continue balance.
Device missing: 0.00B
Used: 403.25GiB
Free (estimated): 31.07GiB (min: 28.57GiB)
Data ratio: 1.00
Metadata ratio: 2.00
Global reserve: 512.00MiB (used: 0.00B)
Data,single: Size:416.70GiB, Used:390.62GiB
/dev/sdi2 416.70GiB
Metadata,DUP: Size:7.00GiB, Used:6.31GiB
/dev/sdi2 14.00GiB
System,DUP: Size:32.00MiB, Used:96.00KiB
/dev/sdi2 64.00MiB
Unallocated:
/dev/sdi2 5.00GiB
now balance works
$ sudo btrfs balance start -m /mnt/fs/
Done, had to relocate 15 out of 433 chunks
$ sudo btrfs balance start /mnt/fs/
it's still going but most likley it will finish
$ sudo btrfs balance status /mnt/fs/
Balance on '/mnt/fs/' is running
26 out of about 431 chunks balanced (27 considered), 94% left
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