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</o:shapelayout></xml><![endif]--></head><body lang=EN-US link=blue vlink=purple><div class=WordSection1><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>The network-bridge script does some pretty horrific things to networking while it starts. I’m not surprised if the interruption is enough to cause CMAN to fail.<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>We avoided this by not using Xen’s network-bridge utility. Just configure your physical interfaces and bridge devices in /etc/sysconfig/network-scripts, and specify a bridge name in each /etc/xen/<domU> script. (In xend-config.sxp you can set network-script to “/bin/true”. Just remember to also turn on IP forwarding.)<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>The advantages of doing it this way are that you get tighter control over your host networking, and starting/stopping xend won’t interrupt networking. (The main disadvantage is that the networking configuration is harder to port to a non-Red Hat OS, but if you already need clustering that probably doesn’t matter.)<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><b><span style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'>From:</span></b><span style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'> linux-cluster-bounces@redhat.com [mailto:linux-cluster-bounces@redhat.com] <b>On Behalf Of </b>Paras pradhan<br><b>Sent:</b> Monday, August 30, 2010 12:43 PM<br><b>To:</b> linux clustering<br><b>Subject:</b> [Linux-cluster] cluster and xen bridge issue<o:p></o:p></span></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>Hi,<o:p></o:p></p><div><p class=MsoNormal><o:p> </o:p></p></div><div><p class=MsoNormal>I have a three node red hat cluster (for xen virualization) and everything is running great until I add a 2nd interface and 2nd bridge.<o:p></o:p></p></div><div><p class=MsoNormal><o:p> </o:p></p></div><div><p class=MsoNormal>This is how I added the 2nd bridge <span class=apple-style-span><span style='font-size:9.0pt;font-family:"Helvetica","sans-serif"'> <a href="http://toic.org/2008/10/06/multiple-network-interfaces-in-xen/">http://toic.org/2008/10/06/multiple-network-interfaces-in-xen/</a></span></span><o:p></o:p></p></div><div><p class=MsoNormal><o:p> </o:p></p></div><div><p class=MsoNormal><span class=apple-style-span><span style='font-size:9.0pt;font-family:"Helvetica","sans-serif"'>After reboot, cluster comes up fine and when xend comes up, cman dies.</span></span><o:p></o:p></p></div><div><p class=MsoNormal><o:p> </o:p></p></div><div><p class=MsoNormal><span class=apple-style-span><span style='font-size:9.0pt;font-family:"Helvetica","sans-serif"'>Log (from other node):</span></span><o:p></o:p></p></div><div><p class=MsoNormal><o:p> </o:p></p></div><div><p class=MsoNormal><span class=apple-style-span><span style='font-size:9.0pt;font-family:"Helvetica","sans-serif"'>--</span></span><o:p></o:p></p></div><div><p style='margin:0in;margin-bottom:.0001pt'><span style='font-size:9.0pt;font-family:"Helvetica","sans-serif"'>Aug 27 15:13:23 cvtst2 openais[6343]: [TOTEM] Retransmit List: 52 53 <o:p></o:p></span></p><p style='margin:0in;margin-bottom:.0001pt'><span style='font-size:9.0pt;font-family:"Helvetica","sans-serif"'>Aug 27 15:13:23 cvtst2 last message repeated 3 times<o:p></o:p></span></p><p style='margin:0in;margin-bottom:.0001pt'><span style='font-size:9.0pt;font-family:"Helvetica","sans-serif"'>Aug 27 15:13:23 cvtst2 openais[6343]: [TOTEM] Retransmit List: 53 <o:p></o:p></span></p><p style='margin:0in;margin-bottom:.0001pt'><span style='font-size:9.0pt;font-family:"Helvetica","sans-serif"'>Aug 27 15:13:23 cvtst2 openais[6343]: [TOTEM] Retransmit List: 53 <o:p></o:p></span></p><p style='margin:0in;margin-bottom:.0001pt'><span style='font-size:9.0pt;font-family:"Helvetica","sans-serif"'>Aug 27 15:13:59 cvtst2 openais[6343]: [TOTEM] FAILED TO RECEIVE <o:p></o:p></span></p><p style='margin:0in;margin-bottom:.0001pt'><span style='font-size:9.0pt;font-family:"Helvetica","sans-serif"'>Aug 27 15:13:59 cvtst2 openais[6343]: [TOTEM] entering GATHER state from 6. <o:p></o:p></span></p><p style='margin:0in;margin-bottom:.0001pt'><span style='font-size:9.0pt;font-family:"Helvetica","sans-serif"'>Aug 27 15:13:59 cvtst2 openais[6343]: [TOTEM] FAILED TO RECEIVE <o:p></o:p></span></p><p style='margin:0in;margin-bottom:.0001pt'><span style='font-size:9.0pt;font-family:"Helvetica","sans-serif"'>Aug 27 15:13:59 cvtst2 openais[6343]: [TOTEM] entering GATHER state from 6. <o:p></o:p></span></p><p style='margin:0in;margin-bottom:.0001pt'><span style='font-size:9.0pt;font-family:"Helvetica","sans-serif"'>Aug 27 15:14:00 cvtst2 openais[6343]: [TOTEM] FAILED TO RECEIVE <o:p></o:p></span></p><div><p class=MsoNormal><span style='font-size:9.0pt;font-family:"Helvetica","sans-serif"'>---<o:p></o:p></span></p></div><div><p class=MsoNormal><span style='font-size:9.0pt;font-family:"Helvetica","sans-serif"'><o:p> </o:p></span></p></div><p class=MsoNormal><span class=apple-style-span><span style='font-family:"Arial","sans-serif"'>But if I execute as root (for 2nd bridge) : /etc/xen/scripts/network-bridge start vifnum=1 netdev=eth1 bridge=xenbr1,</span></span><span style='font-family:"Arial","sans-serif"'><br><span class=apple-style-span>I am not seeing any issue. </span></span><o:p></o:p></p></div><div><p class=MsoNormal><o:p> </o:p></p></div><div><p class=MsoNormal><span class=apple-style-span><span style='font-family:"Arial","sans-serif"'>It looks like after the cman started , xend is trying to reconfigure the both bridges and cluster dies.</span></span><span style='font-family:"Arial","sans-serif"'><br><span class=apple-style-span>I hope I explained properly.</span><br><span class=apple-style-span>Need some help</span><br><span class=apple-style-span>Thanks</span><br><span class=apple-style-span>Paras.</span></span><span class=apple-style-span><span style='font-size:9.0pt;font-family:"Helvetica","sans-serif"'><o:p></o:p></span></span></p><div><p class=MsoNormal style='line-height:14.25pt'><span style='font-size:9.0pt;font-family:"Courier New";color:#666666'><br><br><span class=apple-style-span><o:p></o:p></span></span></p></div><div><p class=MsoNormal><o:p> </o:p></p></div></div></div></body></html>