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<p class="MsoNormal"><span lang="EN-US">Hi, all<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p>&nbsp;</o:p></span></p>
<p class="MsoListParagraph" style="margin-left:18.0pt;text-indent:-18.0pt;mso-list:l0 level1 lfo1">
<![if !supportLists]><span lang="EN-US"><span style="mso-list:Ignore">1)<span style="font:7.0pt &quot;Times New Roman&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
</span></span></span><![endif]><span lang="EN-US">The type of storage domain was IPSAN.<o:p></o:p></span></p>
<p class="MsoListParagraph" style="margin-left:18.0pt;text-indent:0cm"><span lang="EN-US"><o:p>&nbsp;</o:p></span></p>
<p class="MsoListParagraph" style="margin-left:18.0pt;text-indent:-18.0pt;mso-list:l0 level1 lfo1">
<![if !supportLists]><span lang="EN-US"><span style="mso-list:Ignore">2)<span style="font:7.0pt &quot;Times New Roman&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
</span></span></span><![endif]><span lang="EN-US">All hosts worked well in the ovirt, and the mailboxes in SPM and other hosts were OK.<o:p></o:p></span></p>
<p class="MsoListParagraph" style="margin-left:18.0pt;text-indent:0cm"><span lang="EN-US"><o:p>&nbsp;</o:p></span></p>
<p class="MsoListParagraph" style="margin-left:18.0pt;text-indent:-18.0pt;mso-list:l0 level1 lfo1">
<![if !supportLists]><span lang="EN-US"><span style="mso-list:Ignore">3)<span style="font:7.0pt &quot;Times New Roman&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
</span></span></span><![endif]><span lang="EN-US">Something occurred in the switcher of the network, and all of the iscsi IPs in the IPSAN were unreachable.
<o:p></o:p></span></p>
<p class="MsoListParagraph"><span lang="EN-US"><o:p>&nbsp;</o:p></span></p>
<p class="MsoListParagraph" style="margin-left:18.0pt;text-indent:-18.0pt;mso-list:l0 level1 lfo1">
<![if !supportLists]><span lang="EN-US"><span style="mso-list:Ignore">4)<span style="font:7.0pt &quot;Times New Roman&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
</span></span></span><![endif]><span lang="EN-US">What should be happened in this case?<o:p></o:p></span></p>
<p class="MsoListParagraph"><span lang="EN-US"><o:p>&nbsp;</o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">In my opinion, the command named &#8216;dd&#8217; would be stuck if the data-plane in the host was off. The monitor thread of HSM and SPM would be stuck on the &#8216;dd&#8217; command.<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p>&nbsp;</o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">How to recover the VDSM in this situation? Could asynchronous IO be taken into consideration?<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p>&nbsp;</o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">Operation Test:<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">[root@qixiaozhen tmp]#<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">[root@qixiaozhen tmp]# iscsiadm -m session<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">tcp: [1] 172.50.16.21:3260,14 iqn.2006-08.com.huawei:oceanstor:21000022a100ecba:notconfig:172.50.16.21<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">tcp: [2] 172.50.16.20:3260,4 iqn.2006-08.com.huawei:oceanstor:21000022a100ecba:notconfig:172.50.16.20<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">tcp: [3] 172.40.16.20:3260,3 iqn.2006-08.com.huawei:oceanstor:21000022a100ecba:notconfig:172.40.16.20<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">tcp: [4] 172.40.16.21:3260,13 iqn.2006-08.com.huawei:oceanstor:21000022a100ecba:notconfig:172.40.16.21<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">[root@qixiaozhen tmp]# iptables -I INPUT -s 172.50.16.21 -j DROP<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">[root@qixiaozhen tmp]# iptables -I INPUT -s 172.50.16.20 -j DROP<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">[root@qixiaozhen tmp]# iptables -I INPUT -s 172.40.16.20 -j DROP<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">[root@qixiaozhen tmp]# iptables -I INPUT -s 172.40.16.21 -j DROP<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">[root@qixiaozhen tmp]#<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">[root@qixiaozhen tmp]# dd if=/dev/disk/by-id/scsi-360022a110000ecba3d5728bb00000015 of=/dev/null bs=1M count=1 iflag=direct&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &lt;&lt;&lt;&lt;&lt;&lt;&lt;&lt;&lt;&lt; iscsi ip is unreachable, operation is stuck here<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">^C^C^C<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p>&nbsp;</o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p>&nbsp;</o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">Thank you.<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p>&nbsp;</o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">Qi<o:p></o:p></span></p>
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