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<DIV><FONT color=#000000 size=3 face=宋体>Thanks for your
reminders, I found the reason now, it's my own fault!</FONT></DIV>
<DIV>I tried to optimize the snapshot_instance process like this
blueprint:</DIV>
<DIV><A
href="https://blueprints.launchpad.net/glance/+spec/hierarchical-images">https://blueprints.launchpad.net/glance/+spec/hierarchical-images</A></DIV>
<DIV>and I copied the call_if_no_exists & copy_and_extend methods, and I
forgot the locks @utils.synchronized!</DIV>
<DIV>I think it's really OK now.</DIV>
<DIV> </DIV>
<DIV>What a stupid mistake!</DIV>
<DIV> </DIV>
<DIV align=left><FONT color=#c0c0c0 size=2 face=Verdana>2012-09-26</FONT></DIV>
<DIV align=left><FONT size=2 face=Verdana>
<HR style="WIDTH: 122px; HEIGHT: 2px" id=SignNameHR align=left SIZE=2>
</FONT></DIV>
<DIV align=left><FONT color=#c0c0c0 size=2 face=Verdana><SPAN
id=_FlashSignName>Wangpan</SPAN></FONT></DIV>
<DIV><FONT size=2 face=Verdana>
<HR>
</FONT></DIV>
<DIV><FONT size=2 face=Verdana><STRONG>发件人：</STRONG>Boris Filippov</FONT></DIV>
<DIV><FONT size=2
face=Verdana><STRONG>发送时间：</STRONG>2012-09-26 03:25</FONT></DIV>
<DIV><FONT size=2 face=Verdana><STRONG>主题：</STRONG>Re: Re: [Openstack] [Nova]
Got 'qemu-img: error while writing sector 634880: Input/output error' in
_create_image</FONT></DIV>
<DIV><FONT size=2
face=Verdana><STRONG>收件人：</STRONG>"Wangpan"<hzwangpan@corp.netease.com></FONT></DIV>
<DIV><FONT size=2 face=Verdana><STRONG>抄送：</STRONG>"Razique
Mahroua"<razique.mahroua@gmail.com>,"Scott
Moser"<smoser@ubuntu.com>,"openstack"<openstack@lists.launchpad.net></FONT></DIV>
<DIV><FONT size=2 face=Verdana></FONT> </DIV>
<DIV><FONT size=2 face=Verdana>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. <BR><SPAN
style="BACKGROUND-COLOR: rgb(255,255,255); FONT-FAMILY: arial,sans-serif; COLOR: rgb(34,34,34); FONT-SIZE: 13px">-
disk full really might be the case. Simple check is to extend available space
and try to reproduce it again.</SPAN><BR><BR>
<DIV class=gmail_quote>2012/9/25 Wangpan <SPAN dir=ltr><<A
href="mailto:hzwangpan@corp.netease.com"
target=_blank>hzwangpan@corp.netease.com</A>></SPAN><BR>
<BLOCKQUOTE
style="BORDER-LEFT: #ccc 1px solid; MARGIN: 0px 0px 0px 0.8ex; PADDING-LEFT: 1ex"
class=gmail_quote><U></U>
<DIV
style="LINE-HEIGHT: 1.3; BORDER-RIGHT-WIDTH: 0px; MARGIN: 12px; BORDER-TOP-WIDTH: 0px; BORDER-BOTTOM-WIDTH: 0px; BORDER-LEFT-WIDTH: 0px"
marginheight="0" marginwidth="0">
<DIV><FONT face=Verdana>Thanks for your clue.</FONT></DIV>
<DIV><FONT face=Verdana>yes, the occured condition of my issue is
the same as BUG <U>1014227</U>, but the difference is that my instance
directory is NOT shared between compute nodes,</FONT></DIV>
<DIV><FONT face=Verdana>the instances' images are saved in local disk on
compute nodes.</FONT></DIV>
<DIV><FONT face=Verdana>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.</FONT></DIV>
<DIV><FONT face=Verdana>Thanks again.<BR></FONT></DIV>
<DIV> </DIV>
<DIV align=left><FONT color=#c0c0c0 face=Verdana>2012-09-25</FONT></DIV>
<DIV align=left><FONT face=Verdana>
<HR style="MIN-HEIGHT: 2px; WIDTH: 122px" align=left SIZE=2>
<SPAN class=HOEnZb><FONT color=#888888></FONT></SPAN></FONT></DIV><SPAN
class=HOEnZb><FONT color=#888888>
<DIV align=left><FONT color=#c0c0c0
face=Verdana><SPAN>Wangpan</SPAN></FONT></DIV>
<DIV><FONT face=Verdana>
<HR>
</FONT></DIV>
<DIV><FONT face=Verdana><STRONG>发件人：</STRONG>Boris Filippov</FONT></DIV>
<DIV><FONT
face=Verdana><STRONG>发送时间：</STRONG>2012-09-24 19:59</FONT></DIV>
<DIV><FONT face=Verdana><STRONG>主题：</STRONG>Re: [Openstack] [Nova] Got
'qemu-img: error while writing sector 634880: Input/output error' in
_create_image</FONT></DIV>
<DIV><FONT face=Verdana><STRONG>收件人：</STRONG>"Razique Mahroua"<<A
href="mailto:razique.mahroua@gmail.com"
target=_blank>razique.mahroua@gmail.com</A>></FONT></DIV>
<DIV><FONT face=Verdana><STRONG>抄送：</STRONG>"Wangpan"<<A
href="mailto:hzwangpan@corp.netease.com"
target=_blank>hzwangpan@corp.netease.com</A>>,"openstack"<<A
href="mailto:openstack@lists.launchpad.net"
target=_blank>openstack@lists.launchpad.net</A>></FONT></DIV></FONT></SPAN>
<DIV>
<DIV class=h5>
<DIV><FONT face=Verdana></FONT> </DIV>
<DIV><FONT face=Verdana>Your instance directory is shared between compute
nodes?<BR>Similar issue was fixed for folsom-rc1 <BR><A
href="https://review.openstack.org/#/c/12024/"
target=_blank>https://review.openstack.org/#/c/12024/</A><BR>
<DIV class=gmail_quote><A href="https://bugs.launchpad.net/nova/+bug/1014227"
target=_blank>https://bugs.launchpad.net/nova/+bug/1014227</A><BR><BR><BR>2012/9/24
Razique Mahroua <SPAN dir=ltr><<A href="mailto:razique.mahroua@gmail.com"
target=_blank>razique.mahroua@gmail.com</A>></SPAN><BR>
<BLOCKQUOTE
style="BORDER-LEFT: #ccc 1px solid; MARGIN: 0px 0px 0px 0.8ex; PADDING-LEFT: 1ex"
class=gmail_quote>
<DIV style="WORD-WRAP: break-word">Here is what I found
<DIV><A href="http://comments.gmane.org/gmane.comp.emulators.qemu/153254"
target=_blank>http://comments.gmane.org/gmane.comp.emulators.qemu/153254</A></DIV>
<DIV><A href="http://osdir.com/ml/qemu-devel/2012-05/msg04234.html"
target=_blank>http://osdir.com/ml/qemu-devel/2012-05/msg04234.html</A></DIV>
<DIV><BR></DIV>
<DIV>What do you think ?</DIV>
<DIV><BR></DIV>
<DIV>
<DIV>
<DIV><SPAN
style="BORDER-SPACING: 0px; BORDER-COLLAPSE: separate; FONT-FAMILY: 'Lucida Grande'"><SPAN
style="FONT-FAMILY: Helvetica"><SPAN style="FONT-FAMILY: Helvetica"><B
style="COLOR: rgb(19,112,138)">Nuage & Co - Razique
Mahroua</B></SPAN><SPAN
style="FONT-FAMILY: Helvetica; COLOR: rgb(19,112,138)"><B> </B></SPAN><SPAN
style="LINE-HEIGHT: normal; TEXT-TRANSFORM: none; FONT-VARIANT: normal; FONT-STYLE: normal; TEXT-INDENT: 0px; BORDER-COLLAPSE: separate; FONT-FAMILY: Helvetica; WHITE-SPACE: normal; LETTER-SPACING: normal; FONT-SIZE: medium; WORD-SPACING: 0px"><SPAN
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<DIV
style="FONT-STYLE: normal; FONT-FAMILY: Helvetica; FONT-SIZE: medium; FONT-WEIGHT: normal"><FONT
color=#13708a><A href="mailto:razique.mahroua@gmail.com"
target=_blank>razique.mahroua@gmail.com</A></FONT></DIV></SPAN><BR><SPAN></SPAN><SPAN
style="FONT-STYLE: normal; FONT-FAMILY: Helvetica; FONT-SIZE: medium; FONT-WEIGHT: normal"></SPAN><SPAN
style="FONT-WEIGHT: normal"></SPAN></SPAN><SPAN><IMG width=125
height=125></SPAN> </SPAN></SPAN></SPAN></DIV><BR></DIV>
<DIV>
<DIV>Le 24 sept. 2012 à 10:43, Wangpan <<A
href="mailto:hzwangpan@corp.netease.com"
target=_blank>hzwangpan@corp.netease.com</A>> a écrit :</DIV><BR>
<BLOCKQUOTE type="cite">
<DIV
style="BORDER-RIGHT-WIDTH: 0px; TEXT-TRANSFORM: none; TEXT-INDENT: 0px; MARGIN: 12px; FONT: 12pt/1.3 宋体,serif; WHITE-SPACE: normal; BORDER-TOP-WIDTH: 0px; BORDER-BOTTOM-WIDTH: 0px; LETTER-SPACING: normal; BORDER-LEFT-WIDTH: 0px; WORD-SPACING: 0px"
marginheight="0" marginwidth="0">
<DIV>
<DIV><FONT size=3 face=宋体>qemu-img check -f qcow2 test.qcow2<BR>No errors
were found on the image.</FONT></DIV>
<DIV> </DIV>
<DIV align=left><FONT color=#c0c0c0 face=Verdana>2012-09-24</FONT></DIV>
<DIV align=left><FONT face=Verdana>
<HR style="MIN-HEIGHT: 2px; WIDTH: 122px" align=left SIZE=2>
</FONT></DIV>
<DIV align=left><FONT color=#c0c0c0 face=Verdana>Wangpan</FONT></DIV>
<DIV><FONT face=Verdana>
<HR>
</FONT></DIV>
<DIV><FONT face=Verdana><STRONG>发件人：</STRONG>Razique Mahroua</FONT></DIV>
<DIV><FONT
face=Verdana><STRONG>发送时间：</STRONG>2012-09-24 16:30</FONT></DIV>
<DIV><FONT face=Verdana><STRONG>主题：</STRONG>Re: Re: [Openstack] [Nova] Got
'qemu-img: error while writing sector 634880: Input/output error' in
_create_image</FONT></DIV>
<DIV><FONT face=Verdana><STRONG>收件人：</STRONG>"Wangpan"<<A
href="mailto:hzwangpan@corp.netease.com"
target=_blank>hzwangpan@corp.netease.com</A>></FONT></DIV>
<DIV><FONT face=Verdana><STRONG>抄送：</STRONG>"openstack"<<A
href="mailto:openstack@lists.launchpad.net"
target=_blank>openstack@lists.launchpad.net</A>></FONT></DIV>
<DIV><FONT face=Verdana></FONT> </DIV></DIV>
<DIV><FONT face=Verdana>
<DIV>hi,
<DIV>what about a </DIV>
<DIV>qemu-img check -f qcow2 test.qcow2</DIV>
<DIV><BR></DIV></DIV>
<DIV><BR>
<DIV><SPAN
style="TEXT-TRANSFORM: none; TEXT-INDENT: 0px; BORDER-SPACING: 0px; BORDER-COLLAPSE: separate; FONT: medium 'Lucida Grande'; WHITE-SPACE: normal; LETTER-SPACING: normal; WORD-SPACING: 0px"><SPAN
style="FONT-FAMILY: Helvetica">
<DIV><SPAN style="FONT-FAMILY: Helvetica"><B
style="COLOR: rgb(19,112,138)">Nuage & Co - Razique
Mahroua</B></SPAN><SPAN
style="FONT-FAMILY: Helvetica; COLOR: rgb(19,112,138)"><B> </B></SPAN></DIV><SPAN
style="LINE-HEIGHT: normal; TEXT-TRANSFORM: none; FONT-VARIANT: normal; FONT-STYLE: normal; TEXT-INDENT: 0px; BORDER-SPACING: 0px; BORDER-COLLAPSE: separate; FONT-FAMILY: Helvetica; WHITE-SPACE: normal; LETTER-SPACING: normal; FONT-SIZE: medium; WORD-SPACING: 0px"><SPAN
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<DIV
style="FONT-STYLE: normal; FONT-FAMILY: Helvetica; FONT-SIZE: medium; FONT-WEIGHT: normal"><FONT
color=#13708a><A href="mailto:razique.mahroua@gmail.com"
target=_blank>razique.mahroua@gmail.com</A></FONT></DIV></SPAN><BR><SPAN></SPAN><SPAN
style="FONT-STYLE: normal; FONT-FAMILY: Helvetica; FONT-SIZE: medium; FONT-WEIGHT: normal"></SPAN><SPAN
style="FONT-WEIGHT: normal"></SPAN></SPAN><SPAN><SPAN><NUAGECO-LOGO-Fblan_petit(1).jpg></SPAN></SPAN></SPAN></SPAN></SPAN></DIV>
<DIV><BR>
<DIV>
<DIV>Le 24 sept. 2012 à 10:19, "Wangpan"<<A
href="mailto:hzwangpan@corp.netease.com"
target=_blank>hzwangpan@corp.netease.com</A>> a écrit :</DIV><BR>
<BLOCKQUOTE type="cite">Thanks for your attention!<BR><BR>- 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.<BR>- permission issues ----#
Not this reason, too. explain as above.<BR><BR>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,<SPAN> </SPAN><BR>I have
verified this by running two same commands continuously such
as:<BR>qemu-img convert -f qcow2 -O raw test.qcow2 test.part
&<BR>and one of them give me the same error:<BR>qemu-img: error
while writing sector 1052672: Input/output
error</BLOCKQUOTE></DIV></DIV></DIV></FONT></DIV></DIV></BLOCKQUOTE></DIV><BR></DIV></DIV><BR>_______________________________________________<BR>Mailing
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