* Re: btrfs ENOSPC "not the usual problem"
2016-06-03 17:42 ` Liu Bo
@ 2016-06-04 7:44 ` Omari Stephens
2016-06-05 0:11 ` Omari Stephens
1 sibling, 0 replies; 5+ messages in thread
From: Omari Stephens @ 2016-06-04 7:44 UTC (permalink / raw)
To: bo.li.liu; +Cc: linux-btrfs, Omari Stephens
[-- Attachment #1: Type: text/plain, Size: 3440 bytes --]
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
07:41:19> [root{slobol}@/var/tmp]
#uname -a
Linux slobol 4.5.0-2-amd64 #1 SMP Debian 4.5.5-1 (2016-05-29) x86_64
GNU/Linux
07:42:35> [root{slobol}@/var/tmp]
#btrfs --version
btrfs-progs v4.5.2
btrfs_debug output is attached.
--xsdg
[-- Attachment #2: home_btrfs_debug.txt --]
[-- Type: text/plain, Size: 41899 bytes --]
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block group offset 471266754560 len 1073741824 used 0 chunk_objectid 256 flags 1 usage 0.00
block group offset 472340496384 len 1073741824 used 0 chunk_objectid 256 flags 1 usage 0.00
block group offset 473414238208 len 1073741824 used 0 chunk_objectid 256 flags 1 usage 0.00
block group offset 474487980032 len 1073741824 used 0 chunk_objectid 256 flags 1 usage 0.00
block group offset 475561721856 len 1073741824 used 0 chunk_objectid 256 flags 1 usage 0.00
block group offset 476635463680 len 1073741824 used 0 chunk_objectid 256 flags 1 usage 0.00
total_free 211882446848 min_used 0 free_of_min_used 1073741824 block_group_of_min_used 476635463680
balance block group (476635463680) can reduce the number of data block group
^ permalink raw reply [flat|nested] 5+ messages in thread* Re: btrfs ENOSPC "not the usual problem"
2016-06-03 17:42 ` Liu Bo
2016-06-04 7:44 ` Omari Stephens
@ 2016-06-05 0:11 ` Omari Stephens
1 sibling, 0 replies; 5+ messages in thread
From: Omari Stephens @ 2016-06-05 0:11 UTC (permalink / raw)
To: bo.li.liu; +Cc: linux-btrfs, Omari Stephens
[-- Attachment #1: Type: text/plain, Size: 4405 bytes --]
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
[-- Attachment #2: home_btrfs_debug_fixed.txt --]
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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
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