Re: cancel btrfs delete job

[Satoru Takeuchi <takeuchi_satoru@jp.fujitsu.com>]

Hi Franziska,

(2014/06/26 20:34), Franziska Näpelt wrote:
> Hi Satoru,
>
> I'm sorry, but the boot process is always runnig(i hope so), i can't
> login until now. So therefore i have currently no logs.
> I don't want to interrupt these process, because there are a lot of
> fileactions on the harddrive (LED is blinking).
>
> I'm not sure about the mkfs.btrfs option, because the system was set up
> more than one year ago.
>
> mount-options in fstab:
> LABEL=btrfs-pool /mnt/btrfs btrfs compress=lzo,degraded 0 1
>
> kernel version is 3.15 on a Debian Whezzy with current btrfs-tools
> installed
>
> Can you estimate, how long the boot-process (repairing btrfs?) could
> take? The boot-process works for five hours now.

To do so, I'll try to follow your steps with the system which similar
to your environment as possible. Unfortunately I don't have plenty
of disks.

Thanks,
Satoru

>
> best regards,
> Franziska
>
>
>
> Hi Franziska,
>
> (2014/06/26 19:05), Franziska Näpelt wrote:
>> Hello Satoru,
>>
>> here are your requested informations:
>>
>> environment:
>>
>> - four 2 TB disks: /dev/sd[c-f]
>> - two 3 TB disks: /dev/sdg (but until now, only one is connected)
>>
>> filesystem consists of/dev/sd[c-f]
>>
>> I wanted to replace /dev/sdc by /dev/sdg ( with commands add and after
>> that delete.
>> In the second step, I wanted to replace the next disk.
>>
>> But it hanged during btrfs delete command (after successfull add).
>> The delete process was still in progress, but with iotop it seems to me, that there is was no data transfer.
>
> Hm, them something bad would happen on Btrfs.
>
>> Today in the morning the hole computer hangs and there was no other possibility than reset :(
>
> So, unfortunately any debug info like sysrq-w can't be get.
>
>>
>> Until now, he tries to boot with a lot of erros. But I can see, that there are fileactions on the harddrive.
>>
>> There are a lot of following messages:
>> btrfs free space inode generation (0) did not match free space cache generation
>
> And doesn't finish to mount process?
>
> Your filesystem is in inconsistent state since you
> reset during rebalancing filesystem which triggered by
> device deletion.
>
> The following link would help you. But I'm not sure whether
> your data can be restored or not.
>
> https://btrfs.wiki.kernel.org/index.php/Btrfsck
>
> Could you tell me your mkfs.btrfs options, mount options,
> and kernel version, if possible? I'd like to try to
> reproduce your problem anyway.
>
> Thanks,
> Satoru
>
>>
>>
>> best regards,
>> Franziska
>>
>> -------- Weitergeleitete Nachricht --------
>> Von: Satoru Takeuchi <takeuchi_satoru@jp.fujitsu.com>
>> An: franziska.naepelt@hiperscan.com, linux-btrfs@vger.kernel.org
>> <linux-btrfs@vger.kernel.org>
>> Betreff: Re: cancel btrfs delete job
>> Datum: Thu, 26 Jun 2014 16:17:30 +0900
>>
>> Hi Franziska,
>>
>> (2014/06/24 16:50), Franziska Näpelt wrote:
>>> Hi,
>>>
>>> i want to expand a btrfs filesystem. In the moment I have four 2 TB HDDs
>>> for one btrfs pool.
>>> I want to replace two of the HDDs with 3 TB devices. For this reason i
>>> added as first one 3 TB device. After that, i do the btrfs delete job.
>>> This job lasts since 4 days and it seems, that it hangs.
>>>
>>> Is it possible to cancel a btrfs delete job?
>>> And when so, how can i do that?
>>
>> Unfortunately you can't cancel btrfs delete.
>>
>> Q1. Does your environment and operations are as follows?
>>
>> Environment:
>>     - You have six disks.
>>       - four 2TB disks: /dev/sd[a-d]
>>       - two 3TB disks: /dev/sd[ef]
>>     - Currently your btrfs filesystem consists of /dev/sd[a-d].
>>     - You want to replace /dev/sd[cd] with /dev/[ef].
>>
>> Your operation:
>>     1. Add one 3TB disk, /dev/sde.     # It works correctly.
>>     2. Delete one 2TB disk, /dev/sdc   # Hanged up happens here!
>>
>> Q2. Does I/Os for delete still in progress, or there is no I/O?
>>
>> Thanks,
>> Satoru
>>
>>>
>>> Best regards,
>>> Franziska
>>>
>>>
>>>
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>>
>>
>>
>>
>
>
>
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