On 06/03/2016 05:42 PM, Liu Bo wrote:
On Thu, Jun 02, 2016 at 07:45:49PM +0000, Omari Stephens wrote:
[Note: not on list; please reply-all]
I've read everything I can find about running out of space on btrfs, and it
hasn't helped. I'm currently dead in the water.
Everything I do seems to make the problem monotonically worse — I tried
adding a loopback device to the fs, and now I can't remove it. Then I tried
adding a real device (mSATA) to the fs and now I still can't remove the
loopback device (which is making everything super slow), and I also can't
remove the mSATA. I've removed about 100GB from the filesystem and that
hasn't done anything either.
Is there anything I can to do even figure out how bad things are, what I
need to do to make any kind of forward progress? This is a laptop, so I
don't want to add an external drive only to find out that I can't remove it
without corrupting my filesystem.
### FILESYSTEM STATE
19:23:14> [root{slobol}@/home/xsdg]
#btrfs fi show /home
Label: none uuid: 4776be5b-5058-4248-a1b7-7c213757dfbd
Total devices 3 FS bytes used 221.02GiB
devid 1 size 418.72GiB used 413.72GiB path /dev/sda3
devid 2 size 10.00GiB used 5.00GiB path /dev/loop0
devid 3 size 14.91GiB used 3.00GiB path /dev/sdb1
19:23:33> [root{slobol}@/home/xsdg]
#btrfs fi usage /home
Overall:
Device size: 443.63GiB
Device allocated: 421.72GiB
Device unallocated: 21.91GiB
Device missing: 0.00B
Used: 221.68GiB
Free (estimated): 219.24GiB (min: 208.29GiB)
Data ratio: 1.00
Metadata ratio: 2.00
Global reserve: 228.00MiB (used: 36.00KiB)
Data,single: Size:417.69GiB, Used:220.36GiB
/dev/loop0 5.00GiB
/dev/sda3 409.69GiB
/dev/sdb1 3.00GiB
Metadata,single: Size:8.00MiB, Used:0.00B
/dev/sda3 8.00MiB
Metadata,DUP: Size:2.00GiB, Used:674.45MiB
/dev/sda3 4.00GiB
System,single: Size:4.00MiB, Used:0.00B
/dev/sda3 4.00MiB
System,DUP: Size:8.00MiB, Used:56.00KiB
/dev/sda3 16.00MiB
Unallocated:
/dev/loop0 5.00GiB
/dev/sda3 5.00GiB
/dev/sdb1 11.91GiB
### BALANCE FAILS, EVEN WITH -dusage=0
19:23:02> [root{slobol}@/home/xsdg]
#btrfs balance start -v -dusage=0 .
Dumping filters: flags 0x1, state 0x0, force is off
DATA (flags 0x2): balancing, usage=0
ERROR: error during balancing '.': No space left on device
There may be more info in syslog - try dmesg | tail
1. Could you please show us your `uname -r`?
2.
http://git.kernel.org/cgit/linux/kernel/git/kdave/btrfs-progs.git/tree/btrfs-debugfs
We need to know more information about block group in order to take more
fine-grained balance, so there is a tool for developer called
'btrfs-debugfs', you may download it from the above link, it's a python
script, as long as you're able to run it, try btrfs-debugfs -b
/your_partition.
Thanks,
-liubo
So, given some time and today, I backed up all the data from the
partition and then threw 400GB of external drive at the problem.
Thankfully, that got me out of the jam and I was able to remove the
other devices from the filesystem, in addition to rerunning the balances
(starting with -dusage 0, then -dusage 5, then -dusage 20). After those
steps, this is what I've got:
#btrfs fi show /home
Label: none uuid: 4776be5b-5058-4248-a1b7-7c213757dfbd
Total devices 1 FS bytes used 220.44GiB
devid 1 size 418.72GiB used 273.04GiB path /dev/sda3
I've rerun (and attached) the post-balance output of btrfs-debugfs in
case it's useful for other folks.
Finally, the external drive happened to disappear in the middle of all
this — my SATA-to-USB converter is a bit flaky — and I'm happy that
btrfs complained but didn't OOPS or anything like that. I unplugged it
and plugged it back in and everything was happy again.
All that said, is there any plan/design to make it more difficult to
paint yourself into a corner like this? I still don't understand the
nature of the problem, or why removing such large portions of the
filesystem contents didn't seem to help anything.
--xsdg
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block group offset 268464816128 len 1073741824 used 452673536 chunk_objectid
256 flags 1 usage 0.42
block group offset 272759783424 len 1073741824 used 289034240 chunk_objectid
256 flags 1 usage 0.27
block group offset 284570943488 len 1073741824 used 688451584 chunk_objectid
256 flags 1 usage 0.64
block group offset 285644685312 len 1073741824 used 930525184 chunk_objectid
256 flags 1 usage 0.87
block group offset 286718427136 len 1073741824 used 1035165696 chunk_objectid
256 flags 1 usage 0.96
block group offset 287792168960 len 1073741824 used 1018822656 chunk_objectid
256 flags 1 usage 0.95
block group offset 288865910784 len 1073741824 used 989020160 chunk_objectid
256 flags 1 usage 0.92
block group offset 289939652608 len 1073741824 used 1026482176 chunk_objectid
256 flags 1 usage 0.96
block group offset 291013394432 len 1073741824 used 1027649536 chunk_objectid
256 flags 1 usage 0.96
block group offset 292087136256 len 1073741824 used 1021886464 chunk_objectid
256 flags 1 usage 0.95
block group offset 293160878080 len 1073741824 used 1014824960 chunk_objectid
256 flags 1 usage 0.95
block group offset 328594358272 len 1073741824 used 839618560 chunk_objectid
256 flags 1 usage 0.78
block group offset 331815583744 len 1073741824 used 575057920 chunk_objectid
256 flags 1 usage 0.54
block group offset 332889325568 len 1073741824 used 527880192 chunk_objectid
256 flags 1 usage 0.49
block group offset 333963067392 len 1073741824 used 999260160 chunk_objectid
256 flags 1 usage 0.93
block group offset 353290420224 len 1073741824 used 545071104 chunk_objectid
256 flags 1 usage 0.51
block group offset 354364162048 len 1073741824 used 833794048 chunk_objectid
256 flags 1 usage 0.78
block group offset 355437903872 len 1073741824 used 823230464 chunk_objectid
256 flags 1 usage 0.77
block group offset 356511645696 len 1073741824 used 834535424 chunk_objectid
256 flags 1 usage 0.78
block group offset 357585387520 len 1073741824 used 886026240 chunk_objectid
256 flags 1 usage 0.83
block group offset 358659129344 len 1073741824 used 1069010944 chunk_objectid
256 flags 1 usage 1.00
block group offset 359732871168 len 1073741824 used 1071972352 chunk_objectid
256 flags 1 usage 1.00
block group offset 360806612992 len 1073741824 used 1002172416 chunk_objectid
256 flags 1 usage 0.93
block group offset 395166351360 len 1073741824 used 908156928 chunk_objectid
256 flags 1 usage 0.85
block group offset 396776964096 len 1073741824 used 831447040 chunk_objectid
256 flags 1 usage 0.77
block group offset 397850705920 len 1073741824 used 920543232 chunk_objectid
256 flags 1 usage 0.86
block group offset 398924447744 len 1073741824 used 783454208 chunk_objectid
256 flags 1 usage 0.73
block group offset 402145673216 len 1073741824 used 410923008 chunk_objectid
256 flags 1 usage 0.38
block group offset 403219415040 len 1073741824 used 826814464 chunk_objectid
256 flags 1 usage 0.77
block group offset 406440640512 len 1073741824 used 789172224 chunk_objectid
256 flags 1 usage 0.73
block group offset 408051253248 len 1073741824 used 895356928 chunk_objectid
256 flags 1 usage 0.83
block group offset 409124995072 len 1073741824 used 854667264 chunk_objectid
256 flags 1 usage 0.80
block group offset 410198736896 len 1073741824 used 889831424 chunk_objectid
256 flags 1 usage 0.83
block group offset 411272478720 len 1073741824 used 720928768 chunk_objectid
256 flags 1 usage 0.67
block group offset 412346220544 len 1073741824 used 959545344 chunk_objectid
256 flags 1 usage 0.89
block group offset 413419962368 len 1073741824 used 888860672 chunk_objectid
256 flags 1 usage 0.83
block group offset 414493704192 len 1073741824 used 1070452736 chunk_objectid
256 flags 1 usage 1.00
block group offset 415567446016 len 1073741824 used 1070014464 chunk_objectid
256 flags 1 usage 1.00
block group offset 416641187840 len 1073741824 used 1044406272 chunk_objectid
256 flags 1 usage 0.97
block group offset 417714929664 len 1073741824 used 1052037120 chunk_objectid
256 flags 1 usage 0.98
block group offset 419862413312 len 1073741824 used 1067560960 chunk_objectid
256 flags 1 usage 0.99
block group offset 420936155136 len 1073741824 used 1069322240 chunk_objectid
256 flags 1 usage 1.00
block group offset 422009896960 len 1073741824 used 1042972672 chunk_objectid
256 flags 1 usage 0.97
block group offset 423083638784 len 1073741824 used 1070387200 chunk_objectid
256 flags 1 usage 1.00
block group offset 424157380608 len 1073741824 used 1068650496 chunk_objectid
256 flags 1 usage 1.00
block group offset 425231122432 len 1073741824 used 1058672640 chunk_objectid
256 flags 1 usage 0.99
block group offset 426304864256 len 1073741824 used 1034473472 chunk_objectid
256 flags 1 usage 0.96
block group offset 427378606080 len 1073741824 used 1040265216 chunk_objectid
256 flags 1 usage 0.97
block group offset 428452347904 len 1073741824 used 906088448 chunk_objectid
256 flags 1 usage 0.84
block group offset 429526089728 len 1073741824 used 861179904 chunk_objectid
256 flags 1 usage 0.80
block group offset 430599831552 len 1073741824 used 900288512 chunk_objectid
256 flags 1 usage 0.84
block group offset 432747315200 len 1073741824 used 1064058880 chunk_objectid
256 flags 1 usage 0.99
block group offset 433821057024 len 1073741824 used 984215552 chunk_objectid
256 flags 1 usage 0.92
block group offset 434894798848 len 1073741824 used 864645120 chunk_objectid
256 flags 1 usage 0.81
block group offset 435968540672 len 1073741824 used 955043840 chunk_objectid
256 flags 1 usage 0.89
block group offset 437042282496 len 1073741824 used 802435072 chunk_objectid
256 flags 1 usage 0.75
block group offset 438116024320 len 1073741824 used 892551168 chunk_objectid
256 flags 1 usage 0.83
block group offset 439189766144 len 1073741824 used 875769856 chunk_objectid
256 flags 1 usage 0.82
block group offset 440263507968 len 1073741824 used 911110144 chunk_objectid
256 flags 1 usage 0.85
block group offset 441337249792 len 1073741824 used 940199936 chunk_objectid
256 flags 1 usage 0.88
block group offset 442410991616 len 1073741824 used 1068457984 chunk_objectid
256 flags 1 usage 1.00
block group offset 443484733440 len 1073741824 used 1070211072 chunk_objectid
256 flags 1 usage 1.00
block group offset 444558475264 len 1073741824 used 1068212224 chunk_objectid
256 flags 1 usage 0.99
block group offset 445632217088 len 1073741824 used 1071079424 chunk_objectid
256 flags 1 usage 1.00
block group offset 446705958912 len 1073741824 used 930709504 chunk_objectid
256 flags 1 usage 0.87
total_free 52896837632 min_used 7405568 free_of_min_used 983040
block_group_of_min_used 12582912
balance block group (12582912) can reduce the number of data block group
