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<p class="MsoNormal"><span lang="EN-US" style="font-size:10.5pt; font-family:"Calibri","sans-serif"; color:#1F497D">Thank you, but I have some questions about it.
</span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:10.5pt; font-family:"Calibri","sans-serif"; color:#1F497D"> </span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:10.5pt; font-family:"Calibri","sans-serif"; color:#1F497D">The IP address of network used by o2net is different with that used by o2hb, such as the o2net use 192.168.0.7, but the storage network is 192.168.10.7.</span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:10.5pt; font-family:"Calibri","sans-serif"; color:#1F497D">So the tcp of o2net disconnected while the o2hb is still living writing heartbeat on the iSCSI LUNS.</span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:10.5pt; font-family:"Calibri","sans-serif"; color:#1F497D">Another condition may be that it is the "deadline" io scheduler used, but the TCP message may use CFS, is it may cause o2hb is OK, but the o2net
sometimes lose packets?</span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:10.5pt; font-family:"Calibri","sans-serif"; color:#1F497D"> </span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:10.5pt; font-family:"Calibri","sans-serif"; color:#1F497D">There is one scenario as below:</span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:10.5pt; font-family:"Calibri","sans-serif"; color:#1F497D">The Node 2013-SRV09(num 2) long time without messages from ZHJD-VM6 (num 6), so it disconnects the TCP with ZHJD-VM6 (num 6).</span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:10.5pt; font-family:"Calibri","sans-serif"; color:#1F497D">At the same time, the node ZHJD-VM6 detected TCP disconnection with 2013-SRV09, but ZHJD-VM6 does not reconnect 2013-SRV09, and so the ZHJD-VM6
is hanged.</span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:10.5pt; font-family:"Calibri","sans-serif"; color:#1F497D">At the same time the o2hb is still OK, they did not evict each other, and there are other six nodes in the ocfs2 cluster is still accessing the
storage.</span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:10.5pt; font-family:"Calibri","sans-serif"; color:#1F497D">The two node is hangs up does not communicate with echo other but they can still access the storage disk, and the issue continued more than about
1 hour, we reboot all the nodes in the cluster to solve the issue.</span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:10.5pt; font-family:"Calibri","sans-serif"; color:#1F497D"> </span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:10.5pt; font-family:"Calibri","sans-serif"; color:#1F497D">The syslog digested of 2013-SRV09 is as below:
</span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:10.5pt; font-family:"Calibri","sans-serif"; color:#1F497D">May 4 09:08:34 2013-SRV09 kernel: [310434.984511] o2net: No longer connected to node ZHJD-VM6 (num 6) at 185.200.1.17:7100</span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:10.5pt; font-family:"Calibri","sans-serif"; color:#1F497D">May 4 09:08:34 2013-SRV09 kernel: [310434.984558] (libvirtd,3314,7):dlm_send_remote_convert_request:395 ERROR: Error -112 when sending message
504 (key 0x77c0b1d1) to node 6</span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:10.5pt; font-family:"Calibri","sans-serif"; color:#1F497D">……………………………………………………………………………………………………….</span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:10.5pt; font-family:"Calibri","sans-serif"; color:#1F497D">May 4 09:08:34 2013-SRV09 kernel: [310434.984653] (kvm,58972,29):dlm_send_remote_convert_request:395 ERROR: Error -112 when sending message
504 (key 0x77c0b1d1) to node 6</span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:10.5pt; font-family:"Calibri","sans-serif"; color:#1F497D">May 4 09:08:34 2013-SRV09 kernel: [310434.984663] o2dlm: Waiting on the death of node 6 in domain AE16636E1B83497A88D6A50178172ECA</span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:10.5pt; font-family:"Calibri","sans-serif"; color:#1F497D">……………………………………………………………………………………………………….</span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:10.5pt; font-family:"Calibri","sans-serif"; color:#1F497D">May 4 09:08:39 2013-SRV09 kernel: [310440.077475] (libvirtd,3314,2):dlm_send_remote_convert_request:395 ERROR: Error -107 when sending message
504 (key 0x77c0b1d1) to node 6</span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:10.5pt; font-family:"Calibri","sans-serif"; color:#1F497D">……………………………………………………………………………………………………….</span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:10.5pt; font-family:"Calibri","sans-serif"; color:#1F497D">May 4 10:11:05 2013-SRV09 kernel: [314178.586741] (kvm,58484,10):dlm_send_remote_convert_request:395 ERROR: Error -107 when sending message
504 (key 0x77c0b1d1) to node 6</span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:10.5pt; font-family:"Calibri","sans-serif"; color:#1F497D">May 4 10:11:05 2013-SRV09 kernel: [314178.586768] o2dlm: Waiting on the death of node 6 in domain AE16636E1B83497A88D6A50178172ECA</span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:10.5pt; font-family:"Calibri","sans-serif"; color:#1F497D">May 4 10:11:05 2013-SRV09 kernel: [314178.638607] (kvm,58972,11):dlm_send_remote_convert_request:395 ERROR: Error -107 when sending message
504 (key 0x77c0b1d1) to node 6</span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:10.5pt; font-family:"Calibri","sans-serif"; color:#1F497D">May 4 10:11:05 2013-SRV09 kernel: [314178.638622] o2dlm: Waiting on the death of node 6 in domain AE16636E1B83497A88D6A50178172ECA</span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:10.5pt; font-family:"Calibri","sans-serif"; color:#1F497D"> </span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:10.5pt; font-family:"Calibri","sans-serif"; color:#1F497D">The syslog on node ZHJD-VM6:
</span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:10.5pt; font-family:"Calibri","sans-serif"; color:#1F497D">May 4 09:09:19 ZHJD-VM6 kernel: [348569.574247] o2net: Connection to node 2013-SRV09 (num 2) at 185.200.1.14:7100 shutdown, state 8</span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:10.5pt; font-family:"Calibri","sans-serif"; color:#1F497D">May 4 09:09:19 ZHJD-VM6 kernel: [348569.574317] o2net: No longer connected to node 2013-SRV09 (num 2) at 185.200.1.14:7100</span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:10.5pt; font-family:"Calibri","sans-serif"; color:#1F497D">May 4 09:09:19 ZHJD-VM6 kernel: [348569.574371] (dlm_thread,4818,7):dlm_send_proxy_ast_msg:484 ERROR: AE16636E1B83497A88D6A50178172ECA: res
M000000000000000d4a010600000000, error -112 send AST to node 2</span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:10.5pt; font-family:"Calibri","sans-serif"; color:#1F497D">May 4 09:09:19 ZHJD-VM6 kernel: [348569.574388] (dlm_thread,4818,7):dlm_flush_asts:553 ERROR: status = -112</span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:10.5pt; font-family:"Calibri","sans-serif"; color:#1F497D">May 4 09:09:20 ZHJD-VM6 kernel: [348569.605818] (dlm_thread,4818,4):dlm_send_proxy_ast_msg:484 ERROR: AE16636E1B83497A88D6A50178172ECA: res
M00000000000000246c010400000000, error -107 send AST to node 2</span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:10.5pt; font-family:"Calibri","sans-serif"; color:#1F497D">May 4 09:09:20 ZHJD-VM6 kernel: [348569.605839] (dlm_thread,4818,4):dlm_flush_asts:553 ERROR: status = -107</span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:10.5pt; font-family:"Calibri","sans-serif"; color:#1F497D">………………………………………………………………………………………………………………….</span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:10.5pt; font-family:"Calibri","sans-serif"; color:#1F497D">May 4 10:12:30 ZHJD-VM6 kernel: [352357.836983] o2net: No connection established with node 2 after 30.0 seconds, giving up.</span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:10.5pt; font-family:"Calibri","sans-serif"; color:#1F497D">May 4 10:13:00 ZHJD-VM6 kernel: [352387.902370] o2net: No connection established with node 2 after 30.0 seconds, giving up.</span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:10.5pt; font-family:"Calibri","sans-serif"; color:#1F497D"> </span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:10.5pt; font-family:"Calibri","sans-serif"; color:#1F497D">If the condition satisfied, is there some ways to avoid the hangs issues?
</span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:10.5pt; font-family:"Calibri","sans-serif"; color:#1F497D"> </span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:10.5pt; font-family:"Calibri","sans-serif"; color:#1F497D">Thanks a lot.</span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:10.5pt; font-family:"Calibri","sans-serif"; color:#1F497D"> </span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:10.5pt; font-family:"Calibri","sans-serif"; color:#1F497D"> </span></p>
<div style="border:none; border-top:solid #B5C4DF 1.0pt; padding:3.0pt 0cm 0cm 0cm">
<p class="MsoNormal"><b><span style="font-size:10.0pt">发件人<span lang="EN-US">:</span></span></b><span lang="EN-US" style="font-size:10.0pt"> Sunil Mushran [mailto:sunil.mushran@gmail.com]
<br>
</span><b><span style="font-size:10.0pt">发送时间<span lang="EN-US">:</span></span></b><span lang="EN-US" style="font-size:10.0pt"> 2013</span><span style="font-size:10.0pt">年<span lang="EN-US">5</span>月<span lang="EN-US">10</span>日<span lang="EN-US"> 1:02<br>
</span><b>收件人<span lang="EN-US">:</span></b><span lang="EN-US"> guozhonghua 02084<br>
</span><b>抄送<span lang="EN-US">:</span></b><span lang="EN-US"> ocfs2-devel@oss.oracle.com; ocfs2-devel-request@oss.oracle.com; changlimin 00148<br>
</span><b>主题<span lang="EN-US">:</span></b><span lang="EN-US"> Re: [Ocfs2-devel] Patch request reviews, for node reconnecting with other nodes whose node number is little than local, thanks a lot.</span></span></p>
</div>
<p class="MsoNormal"><span lang="EN-US"> </span></p>
<div>
<div>
<p class="MsoNormal" style="margin-bottom:12.0pt"><span lang="EN-US">A better fix is to _not_ disconnect on o2net timeout once a connection has been<br>
cleanly established. Only disconnect on o2hb timeout.</span></p>
</div>
<div>
<p class="MsoNormal" style="margin-bottom:12.0pt"><span lang="EN-US">The reconnects are a problem as we could lose packets and not be aware of it<br>
leading to o2dlm hangs.</span></p>
</div>
<div>
<p class="MsoNormal"><span lang="EN-US">IOW, this patch looks to be papering over one specific problem and does not fix the<br>
underlying issue.</span></p>
</div>
<div>
<p class="MsoNormal"><span lang="EN-US"> </span></p>
</div>
</div>
<div>
<p class="MsoNormal" style="margin-bottom:12.0pt"><span lang="EN-US"> </span></p>
<div>
<p class="MsoNormal"><span lang="EN-US">On Tue, May 7, 2013 at 7:43 PM, Guozhonghua <<a href="mailto:guozhonghua@h3c.com" target="_blank">guozhonghua@h3c.com</a>> wrote:</span></p>
<div>
<div>
<p class="MsoNormal" style=""><span lang="EN-US"> </span></p>
<p class="MsoNormal" style=""><span lang="EN-US">Hi, everyone,</span></p>
<p class="MsoNormal" style=""><span lang="EN-US">I had have a test with eight nodes and find one issue.</span></p>
<p class="MsoNormal" style=""><span lang="EN-US"><br>
The Linux kernel version is 3.2.40.</span></p>
<p class="MsoNormal" style=""><span lang="EN-US"> </span></p>
<p class="MsoNormal" style=""><span lang="EN-US">As I migrate processes from one node to another, those processes is open the files on the OCFS2 storage. Sometime one node shutdown TCP connection with that node whose node number is larger because long time
without any message from it. </span></p>
<p class="MsoNormal" style=""><span lang="EN-US">As the TCP connection shutdown, the node whose number larger did not restart connection to the node, whose number is little and shutdown the TCP connection.</span></p>
<p class="MsoNormal" style=""><span lang="EN-US">So I review the code of the cluster and find it may be a bug.
</span></p>
<p class="MsoNormal" style=""><span lang="EN-US"> </span></p>
<p class="MsoNormal" style=""><span lang="EN-US">I changed it and have a test. </span>
</p>
<p class="MsoNormal" style=""><span lang="EN-US"> </span></p>
<p class="MsoNormal" style=""><span lang="EN-US">Is there anybody having time to view and make sure that those changes is correct?</span></p>
<p class="MsoNormal" style=""><span lang="EN-US">Thanks a lot.</span></p>
<p class="MsoNormal" style=""><span lang="EN-US"> </span></p>
<p class="MsoNormal" style=""><span lang="EN-US">The diff file is as below, of the file is /cluster/tcp.c:
</span></p>
<p class="MsoNormal" style=""><span lang="EN-US"> </span></p>
<p class="MsoNormal" style=""><span lang="EN-US">root@gzh-dev:/home/dev/test_replace/ocfs2_ko# diff -pu ocfs2-ko-3.2-compare/cluster/tcp.c ocfs2-ko-3.2/cluster/tcp.c
</span></p>
<p class="MsoNormal" style=""><span lang="EN-US">--- ocfs2-ko-3.2-compare/cluster/tcp.c 2012-10-29 19:33:19.534200000 +0800</span></p>
<p class="MsoNormal" style=""><span lang="EN-US">+++ ocfs2-ko-3.2/cluster/tcp.c 2013-05-08 09:33:16.386277310 +0800</span></p>
<p class="MsoNormal" style=""><span lang="EN-US">@@ -1699,6 +1698,10 @@ static void o2net_start_connect(struct w</span></p>
<p class="MsoNormal" style=""><span lang="EN-US"> if (ret == -EINPROGRESS)</span></p>
<p class="MsoNormal" style=""><span lang="EN-US"> ret = 0;</span></p>
<p class="MsoNormal" style=""><span lang="EN-US">+ /** Reset the timeout with 0 to avoid connection again */</span></p>
<p class="MsoNormal" style=""><span lang="EN-US">+ if (ret == 0) { </span>
</p>
<p class="MsoNormal" style=""><span lang="EN-US">+ atomic_set(&nn->nn_timeout, 0);
</span></p>
<p class="MsoNormal" style=""><span lang="EN-US">+ }</span></p>
<p class="MsoNormal" style=""><span lang="EN-US">out:</span></p>
<p class="MsoNormal" style=""><span lang="EN-US"> if (ret) {</span></p>
<p class="MsoNormal" style=""><span lang="EN-US"> printk(KERN_NOTICE "o2net: Connect attempt to " SC_NODEF_FMT</span></p>
<p class="MsoNormal" style=""><span lang="EN-US">@@ -1725,6 +1728,11 @@ static void o2net_connect_expired(struct</span></p>
<p class="MsoNormal" style=""><span lang="EN-US"> spin_lock(&nn->nn_lock);</span></p>
<p class="MsoNormal" style=""><span lang="EN-US"> if (!nn->nn_sc_valid) {</span></p>
<p class="MsoNormal" style=""><span lang="EN-US">+ /** trigger reconnect with other nodes whose node number is little than local</span></p>
<p class="MsoNormal" style=""><span lang="EN-US">+ * while they are still able to access the storage</span></p>
<p class="MsoNormal" style=""><span lang="EN-US">+ */</span></p>
<p class="MsoNormal" style=""><span lang="EN-US">+ atomic_set(&nn->nn_timeout, 1);</span></p>
<p class="MsoNormal" style=""><span lang="EN-US">+ </span></p>
<p class="MsoNormal" style=""><span lang="EN-US"> printk(KERN_NOTICE "o2net: No connection established with "</span></p>
<p class="MsoNormal" style=""><span lang="EN-US"> "node %u after %u.%u seconds, giving up.\n",</span></p>
<p class="MsoNormal" style=""><span lang="EN-US"> o2net_num_from_nn(nn),</span></p>
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