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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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