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[Boris Filippov <bfilippov@xxxxxxxxxxxxxxxx>]

Actually, this is unlikely because there was locking for image fetching
already. This patch only adds it for case when several compute processes
share same $instances_dir.
- disk full really might be the case. Simple check is to extend available
space and try to reproduce it again.

2012/9/25 Wangpan <hzwangpan@xxxxxxxxxxxxxxxx>

> **
> Thanks for your clue.
> yes, the occured condition of my issue is the same as BUG *1014227*, but
> the difference is that my instance directory is NOT shared between compute
> nodes,
> the instances' images are saved in local disk on compute nodes.
> I believe the bug Boris found may occur in NOT shared storage circumstance
> as mine, and my issue may be resloved by this patch which adds a lock to
> cache image method.
> Thanks again.
>
> 2012-09-25
>  ------------------------------
>  Wangpan
>  ------------------------------
>  *发件人：*Boris Filippov
> *发送时间：*2012-09-24 19:59
> *主题：*Re: [Openstack] [Nova] Got 'qemu-img: error while writing sector
> 634880: Input/output error' in _create_image
> *收件人：*"Razique Mahroua"<razique.mahroua@xxxxxxxxx>
> *抄送：*"Wangpan"<hzwangpan@xxxxxxxxxxxxxxxx>,"openstack"<
> openstack@xxxxxxxxxxxxxxxxxxx>
>
> Your instance directory is shared between compute nodes?
> Similar issue was fixed for folsom-rc1
> https://review.openstack.org/#/c/12024/
> https://bugs.launchpad.net/nova/+bug/1014227
>
>
> 2012/9/24 Razique Mahroua <razique.mahroua@xxxxxxxxx>
>
>> Here is what I found
>> http://comments.gmane.org/gmane.comp.emulators.qemu/153254
>> http://osdir.com/ml/qemu-devel/2012-05/msg04234.html
>>
>> What do you think ?
>>
>>  *Nuage & Co - Razique Mahroua** *
>> razique.mahroua@xxxxxxxxx
>>
>>
>>  Le 24 sept. 2012 à 10:43, Wangpan <hzwangpan@xxxxxxxxxxxxxxxx> a écrit :
>>
>>   qemu-img check -f qcow2 test.qcow2
>> No errors were found on the image.
>>
>> 2012-09-24
>>  ------------------------------
>>  Wangpan
>>  ------------------------------
>>  *发件人：*Razique Mahroua
>> *发送时间：*2012-09-24 16:30
>> *主题：*Re: Re: [Openstack] [Nova] Got 'qemu-img: error while writing
>> sector 634880: Input/output error' in _create_image
>> *收件人：*"Wangpan"<hzwangpan@xxxxxxxxxxxxxxxx>
>> *抄送：*"openstack"<openstack@xxxxxxxxxxxxxxxxxxx>
>>
>>  hi,
>> what about a
>> qemu-img check -f qcow2 test.qcow2
>>
>>
>>  *Nuage & Co - Razique Mahroua** *
>> razique.mahroua@xxxxxxxxx
>>
>> <NUAGECO-LOGO-Fblan_petit(1).jpg>
>>
>>  Le 24 sept. 2012 à 10:19, "Wangpan"<hzwangpan@xxxxxxxxxxxxxxxx> a écrit
>> :
>>
>> Thanks for your attention!
>>
>> - disk full  ----# I believe there is enough space, because I have tried
>> to boot serveral instances after this error with the same image, they are
>> all booted successfully.
>> - permission issues    ----# Not this reason, too. explain as above.
>>
>> I still believe this is a race problem, if we convert to image from qcow2
>> to raw at a short interval, one of the convertion may fail,
>> I have verified this by running two same commands continuously such as:
>> qemu-img convert -f qcow2 -O raw  test.qcow2 test.part &
>> and one of them give me the same error:
>> qemu-img: error while writing sector 1052672: Input/output error
>>
>>
>>
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>>
>