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Glad you figured out, stupidity is only untamed experience :)

Nuage & Co - Razique Mahroua 
razique.mahroua at gmail.com



Le 26 sept. 2012 à 12:14, "Wangpan"<hzwangpan at corp.netease.com> a écrit :

> Thanks for your reminders, I found the reason now, it's my own fault!
> I tried to optimize the snapshot_instance process like this blueprint:
> https://blueprints.launchpad.net/glance/+spec/hierarchical-images
> and I copied the call_if_no_exists & copy_and_extend methods, and I forgot the locks @utils.synchronized!
> I think it's really OK now.
>  
> What a stupid mistake!
>  
> 2012-09-26
> Wangpan
> 发件人：Boris Filippov
> 发送时间：2012-09-26 03:25
> 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 at corp.netease.com>
> 抄送："Razique Mahroua"<razique.mahroua at gmail.com>,"Scott Moser"<smoser at ubuntu.com>,"openstack"<openstack at lists.launchpad.net>
>  
> 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 at corp.netease.com>
> 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 at gmail.com>
> 抄送："Wangpan"<hzwangpan at corp.netease.com>,"openstack"<openstack at lists.launchpad.net>
>  
> 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 at gmail.com>
> 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 at gmail.com
> 
> 
> 
> Le 24 sept. 2012 à 10:43, Wangpan <hzwangpan at corp.netease.com> 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 at corp.netease.com>
>> 抄送："openstack"<openstack at lists.launchpad.net>
>>  
>> hi, 
>> what about a 
>> qemu-img check -f qcow2 test.qcow2
>> 
>> 
>> Nuage & Co - Razique Mahroua 
>> razique.mahroua at gmail.com
>> 
>> <NUAGECO-LOGO-Fblan_petit(1).jpg>
>> 
>> Le 24 sept. 2012 à 10:19, "Wangpan"<hzwangpan at corp.netease.com> 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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