Re: Intermittent no space errors

[Dave Cundiff <syshackmin@gmail.com>]

Hello,

I installed the git repo kernel and added some debug to the ENOSPC
returns. Unfortunately its still failing. If it helps any its bombing
out in btrfs_check_data_free_space() in extent-tree.c. Returning on
the ENOSPC at line 2959.

Unfortunately that is the extent of my ability to debug a filesystem. :=
P

Thanks,

On Tue, Jul 27, 2010 at 9:19 AM, Yan, Zheng <yanzheng@21cn.com> wrote:
> On Tue, Jul 27, 2010 at 5:09 AM, Dave Cundiff <syshackmin@gmail.com> =
wrote:
>> Hello,
>>
>> On 2.6.35-rc5 I'm seeing some weird behavior under heavy IO loads. I
>> have a backup process that fires up several rsync processes. These
>> mirror several dozen servers to individual sub-volumes. Everyday I
>> snapshot each sub-volume and rsync over it.
>>
>> The problem I'm seeing is my rsync processes are failing randomly wi=
th
>> "No space left on device". This is a 6 Terabyte volume with plenty o=
f
>> free space.
>>
>> Mount options:
>> /dev/sdb on /backups type btrfs (rw,max_inline=3D0,compress)
>>
>> [root@rsync1 ~]# btrfs filesystem df /backups/
>> Data: total=3D1.88TB, used=3D1.88TB
>> Metadata: total=3D43.38GB, used=3D32.06GB
>> System: total=3D12.00MB, used=3D260.00KB
>>
>> [root@rsync1 ~]# df /dev/sdb
>> Filesystem =A0 =A0 =A0 =A0 =A0 1K-blocks =A0 =A0 =A0Used Available U=
se% Mounted on
>> /dev/sdb =A0 =A0 =A0 =A0 =A0 =A0 5781249024 2087273084 3693975940 =A0=
37% /backups
>>
>> They don't all fail at once. Normally I have 4-5 running at a time a=
nd
>> 1 or 2 will drop out with a no space error. The rest continue on. I'=
ve
>> noticed it will generally occur on ones that are in the middle of
>> transferring a very large file. If I lighten the load to one rsync a=
t
>> a time it appears to happen less frequently.
>>
>> Any known issues I should be aware of?
>>
>
> Thank you for reporting this. I will dig in.
>
> Yan, Zheng
>



--=20
Dave Cundiff
System Administrator
A2Hosting, Inc
http://www.a2hosting.com
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