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<p class=MsoNormal><span lang=EN-US>Hi List,<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US><o:p> </o:p></span></p>
<p class=MsoNormal><span lang=EN-US>I have a problem with my OCFS2 volume. I
have two web servers connected to an EqualLogic shared storage via Open-iSCSI. This
web servers are hosting our web presence (Typo3 CMS) and some forums (phpBB 3).
We encountered two cases when OCFS2 cluster is hanging:<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US><o:p> </o:p></span></p>
<p class=MsoListParagraph style='text-indent:-18.0pt;mso-list:l1 level1 lfo4'><![if !supportLists]><span
lang=EN-US><span style='mso-list:Ignore'>1.<span style='font:7.0pt "Times New Roman"'>
</span></span></span><![endif]><span lang=EN-US>CPU usage on one node increases
to 100% because of high MySQL usage or several “convert” processes<o:p></o:p></span></p>
<p class=MsoListParagraph style='text-indent:-18.0pt;mso-list:l1 level1 lfo4'><![if !supportLists]><span
lang=EN-US><span style='mso-list:Ignore'>2.<span style='font:7.0pt "Times New Roman"'>
</span></span></span><![endif]><span lang=EN-US>iSCSI storage is unreachable
for some reason (maybe switch hardware error, power loss, …)<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US><o:p> </o:p></span></p>
<p class=MsoNormal><span lang=EN-US>In case 1 both nodes seem to be unable to
release locks. When I run this command “ps -e -o
pid,stat,comm,wchan=WIDE-WCHAN-COLUMN | grep D” I get a lot of
httpd2-prefork processes and some convert processes with status "D"
on both nodes. Some of them have “ocfs2_lock” in wchan column. I am
unable to kill any of this processes the processes. Kill <processed> and
killall -9 httd2-prefork also does not kill the processes. I had to turn off both
nodes. Rebooting is not possible in this case.<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US><o:p> </o:p></span></p>
<p class=MsoNormal><span lang=EN-US>In case 2 both node are available and idle.
All interfaces including heartbeat are up and running. Then, when I pull iSCSI
network cable from one node, the node is fence itself and reboots after 1
minute. This works as expected. But the other node is not deploying web site
until the “failure” node was rebooted.<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US><o:p> </o:p></span></p>
<p class=MsoNormal><span lang=EN-US>In both cases file system is read-only on
at least one node. Rebooting both machines does not bring the volume back to
read-write. I have to unmount and mount the volume manually.<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US><o:p> </o:p></span></p>
<p class=MsoNormal><span lang=EN-US>I have done some tests with only one running
node. The behavior is the same as described in case 1 and file system is
read-only.<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US><o:p> </o:p></span></p>
<p class=MsoNormal><span lang=EN-US>Have somebody a hint what I can do to
prevent cluster from hang when heartbeat network is up, but one node have lost
connection to OCFS2 volume?<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US>Is there a way to prevent file system from
going into read-only mode?<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US><o:p> </o:p></span></p>
<p class=MsoNormal><span lang=EN-US>Thanks for any help.<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US><o:p> </o:p></span></p>
<p class=MsoNormal><span lang=EN-US>Best regards,<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US>Christian<o:p></o:p></span></p>
</div>
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