* "No space left on device" although df reports only 55% in use
@ 2013-03-26 23:28 Clemens Eisserer
2013-03-27 9:07 ` Clemens Eisserer
` (2 more replies)
0 siblings, 3 replies; 6+ messages in thread
From: Clemens Eisserer @ 2013-03-26 23:28 UTC (permalink / raw)
To: linux-btrfs
Hi,
I am using a btrfs loopback mounted file with lzo-compression on
Linux-3.7.9, and I ran into "No space left on device" messages,
although df reports only 55% of space is used:
# touch testfile
touch: cannot touch `testfile': No space left on device
# df
Filesystem 1K-blocks Used Available Use% Mounted on
/dev/loop0 32768000 17383924 14649172 55% /home/ce/anditest
# btrfs filesystem df .
Data: total=28.22GB, used=14.25GB
System, DUP: total=8.00MB, used=12.00KB
System: total=4.00MB, used=0.00
Metadata, DUP: total=1.50GB, used=1.16GB
Metadata: total=8.00MB, used=0.00
Any ideas what is going wrong here?
Thank you in advance, Clemens
^ permalink raw reply [flat|nested] 6+ messages in thread* Re: "No space left on device" although df reports only 55% in use
2013-03-26 23:28 "No space left on device" although df reports only 55% in use Clemens Eisserer
@ 2013-03-27 9:07 ` Clemens Eisserer
2013-03-27 9:18 ` Hugo Mills
2013-03-27 15:20 ` Josef Bacik
2 siblings, 0 replies; 6+ messages in thread
From: Clemens Eisserer @ 2013-03-27 9:07 UTC (permalink / raw)
To: linux-btrfs
Hi again,
I wonder if this is the intended behaviour or some known issue?
Otherwise I could provide a tool written by a friend of mine which can
trigger this issue within a few minutes on a a fresh btrfs partition.
Its basically a file-system aging tester, which replays some
real-world logs taken from NFS file servers.
Regards, Clemens
^ permalink raw reply [flat|nested] 6+ messages in thread
* Re: "No space left on device" although df reports only 55% in use
2013-03-26 23:28 "No space left on device" although df reports only 55% in use Clemens Eisserer
2013-03-27 9:07 ` Clemens Eisserer
@ 2013-03-27 9:18 ` Hugo Mills
2013-03-27 11:45 ` Bernd Schubert
2013-03-27 14:32 ` Clemens Eisserer
2013-03-27 15:20 ` Josef Bacik
2 siblings, 2 replies; 6+ messages in thread
From: Hugo Mills @ 2013-03-27 9:18 UTC (permalink / raw)
To: Clemens Eisserer; +Cc: linux-btrfs
[-- Attachment #1: Type: text/plain, Size: 1405 bytes --]
On Wed, Mar 27, 2013 at 12:28:23AM +0100, Clemens Eisserer wrote:
> I am using a btrfs loopback mounted file with lzo-compression on
> Linux-3.7.9, and I ran into "No space left on device" messages,
> although df reports only 55% of space is used:
>
> # touch testfile
> touch: cannot touch `testfile': No space left on device
>
> # df
> Filesystem 1K-blocks Used Available Use% Mounted on
> /dev/loop0 32768000 17383924 14649172 55% /home/ce/anditest
>
> # btrfs filesystem df .
> Data: total=28.22GB, used=14.25GB
> System, DUP: total=8.00MB, used=12.00KB
> System: total=4.00MB, used=0.00
> Metadata, DUP: total=1.50GB, used=1.16GB
Your metadata is close to full -- we need quite a lot of working
space to CoW into. You (probably) have the full disk allocated to
chunks, and too much is allocated to data; not enough to metadata. You
need o balance, with a filter for the unused data chunks. See the
section in the FAQ on the wiki about full filesystems. (Sorry for not
finding the link, I'm on a restricted connection right now)
Hugo.
> Metadata: total=8.00MB, used=0.00
>
> Any ideas what is going wrong here?
>
> Thank you in advance, Clemens
--
=== Hugo Mills: hugo@... carfax.org.uk | darksatanic.net | lug.org.uk ===
PGP key: 65E74AC0 from wwwkeys.eu.pgp.net or http://www.carfax.org.uk
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^ permalink raw reply [flat|nested] 6+ messages in thread* Re: "No space left on device" although df reports only 55% in use
2013-03-27 9:18 ` Hugo Mills
@ 2013-03-27 11:45 ` Bernd Schubert
2013-03-27 14:32 ` Clemens Eisserer
1 sibling, 0 replies; 6+ messages in thread
From: Bernd Schubert @ 2013-03-27 11:45 UTC (permalink / raw)
To: Hugo Mills, Clemens Eisserer, linux-btrfs
On 03/27/2013 10:18 AM, Hugo Mills wrote:
> On Wed, Mar 27, 2013 at 12:28:23AM +0100, Clemens Eisserer wrote:
>> I am using a btrfs loopback mounted file with lzo-compression on
>> Linux-3.7.9, and I ran into "No space left on device" messages,
>> although df reports only 55% of space is used:
>>
>> # touch testfile
>> touch: cannot touch `testfile': No space left on device
>>
>> # df
>> Filesystem 1K-blocks Used Available Use% Mounted on
>> /dev/loop0 32768000 17383924 14649172 55% /home/ce/anditest
>>
>> # btrfs filesystem df .
>> Data: total=28.22GB, used=14.25GB
>> System, DUP: total=8.00MB, used=12.00KB
>> System: total=4.00MB, used=0.00
>> Metadata, DUP: total=1.50GB, used=1.16GB
>
> Your metadata is close to full -- we need quite a lot of working
Almost 400MB are not sufficient to do simple touch? What is it doing?
Cheers,
Bernd
^ permalink raw reply [flat|nested] 6+ messages in thread
* Re: "No space left on device" although df reports only 55% in use
2013-03-27 9:18 ` Hugo Mills
2013-03-27 11:45 ` Bernd Schubert
@ 2013-03-27 14:32 ` Clemens Eisserer
1 sibling, 0 replies; 6+ messages in thread
From: Clemens Eisserer @ 2013-03-27 14:32 UTC (permalink / raw)
To: linux-btrfs
Hi Hugo,
>> # btrfs filesystem df .
>> Data: total=28.22GB, used=14.25GB
>> System, DUP: total=8.00MB, used=12.00KB
>> System: total=4.00MB, used=0.00
>> Metadata, DUP: total=1.50GB, used=1.16GB
>
> Your metadata is close to full -- we need quite a lot of working
> space to CoW into. You (probably) have the full disk allocated to
> chunks, and too much is allocated to data; not enough to metadata. You
> need o balance, with a filter for the unused data chunks. See the
> section in the FAQ on the wiki about full filesystems. (Sorry for not
> finding the link, I'm on a restricted connection right now)
I'll re-run the test on a filesystem created with -M (metadata and
normal data combined).
As far as I understand it shouldn't run in the same problem.
> Almost 400MB are not sufficient to do simple touch? What is it doing?
I have to admit that thought occurred to me too ;)
Regards, Clemens
^ permalink raw reply [flat|nested] 6+ messages in thread
* Re: "No space left on device" although df reports only 55% in use
2013-03-26 23:28 "No space left on device" although df reports only 55% in use Clemens Eisserer
2013-03-27 9:07 ` Clemens Eisserer
2013-03-27 9:18 ` Hugo Mills
@ 2013-03-27 15:20 ` Josef Bacik
2 siblings, 0 replies; 6+ messages in thread
From: Josef Bacik @ 2013-03-27 15:20 UTC (permalink / raw)
To: Clemens Eisserer; +Cc: linux-btrfs@vger.kernel.org
On Tue, Mar 26, 2013 at 05:28:23PM -0600, Clemens Eisserer wrote:
> Hi,
>
> I am using a btrfs loopback mounted file with lzo-compression on
> Linux-3.7.9, and I ran into "No space left on device" messages,
> although df reports only 55% of space is used:
>
> # touch testfile
> touch: cannot touch `testfile': No space left on device
>
> # df
> Filesystem 1K-blocks Used Available Use% Mounted on
> /dev/loop0 32768000 17383924 14649172 55% /home/ce/anditest
>
> # btrfs filesystem df .
> Data: total=28.22GB, used=14.25GB
> System, DUP: total=8.00MB, used=12.00KB
> System: total=4.00MB, used=0.00
> Metadata, DUP: total=1.50GB, used=1.16GB
> Metadata: total=8.00MB, used=0.00
>
> Any ideas what is going wrong here?
>
Can I see btrfs fi show and try using btrfs-next and see if the problem is
already fixed. Thanks,
Josef
^ permalink raw reply [flat|nested] 6+ messages in thread
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2013-03-26 23:28 "No space left on device" although df reports only 55% in use Clemens Eisserer
2013-03-27 9:07 ` Clemens Eisserer
2013-03-27 9:18 ` Hugo Mills
2013-03-27 11:45 ` Bernd Schubert
2013-03-27 14:32 ` Clemens Eisserer
2013-03-27 15:20 ` Josef Bacik
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