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<p class="MsoNormal">Mark, <o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">In your case all 30 workers were busy by vdsm.virt.sampling.HostMonitor discarded by timeout, and there were 3000 tasks in the queue.<o:p></o:p></p>
<p class="MsoNormal">I encountered the problem. In my case ISO domain was not responding.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">The issue is that vdsm executor doesn’t remove discarded workers. This is a bug.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal"><b><span style="color:black">From: </span></b><span style="color:black">Mark Greenall <m.greenall@iontrading.com><br>
<b>Date: </b>Monday 6 February 2017 at 18:20<br>
<b>To: </b>Pavel Gashev <Pax@acronis.com>, "users@ovirt.org" <users@ovirt.org><br>
<b>Subject: </b>RE: [ovirt-users] Ovirt 4.0.6 guests 'Not Responding'</span><span style="font-size:12.0pt;color:black"><o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-family:"Times New Roman""><o:p> </o:p></span></p>
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<p class="MsoNormal">Hi Pavel,<o:p></o:p></p>
<p class="MsoNormal"> <o:p></o:p></p>
<p class="MsoNormal">Thanks for responding. I bounced the VDSMD service, the guests recovered and the monitor and queue full messages also cleared. However, we did keep getting intermittent “Guest x Not Responding “ messages being communicated by the Hosted
Engine, in most cases the guests would actually almost immediately recover though. The odd occasion would result in guests staying “Not Responding” and me bouncing the VDSMD service again. The Host had a memory load of around 85% (out of 768GB) and a CPU load
of around 65% (48 cores). I have since added another host to that cluster and spread the guests between the two hosts. This seems to have totally cleared the messages (at least for the last 5 days anyway).<o:p></o:p></p>
<p class="MsoNormal"> <o:p></o:p></p>
<p class="MsoNormal">I suspect the problem is load related. At what capacity would Ovirt regard a host as being ‘full’?<o:p></o:p></p>
<p class="MsoNormal"> <o:p></o:p></p>
<p class="MsoNormal">Thanks,<o:p></o:p></p>
<p class="MsoNormal">Mark<o:p></o:p></p>
<p class="MsoNormal"> <o:p></o:p></p>
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<p class="MsoNormal"><b>From:</b> Pavel Gashev [mailto:Pax@acronis.com] <br>
<b>Sent:</b> 31 January 2017 15:19<br>
<b>To:</b> Mark Greenall <m.greenall@iontrading.com>; users@ovirt.org<br>
<b>Subject:</b> Re: [ovirt-users] Ovirt 4.0.6 guests 'Not Responding'<o:p></o:p></p>
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<p class="MsoNormal"> <o:p></o:p></p>
<p class="MsoNormal">Mark,<o:p></o:p></p>
<p class="MsoNormal"> <o:p></o:p></p>
<p class="MsoNormal">Could you please file a bug report? <o:p></o:p></p>
<p class="MsoNormal"> <o:p></o:p></p>
<p class="MsoNormal">Restart of vdsmd service would help to resolve the “executor queue full” state.<o:p></o:p></p>
<p class="MsoNormal"> <o:p></o:p></p>
<p class="MsoNormal"> <o:p></o:p></p>
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<p class="MsoNormal"><b><span style="color:black">From: </span></b><span style="color:black"><<a href="mailto:users-bounces@ovirt.org">users-bounces@ovirt.org</a>> on behalf of Mark Greenall <<a href="mailto:m.greenall@iontrading.com">m.greenall@iontrading.com</a>><br>
<b>Date: </b>Monday 30 January 2017 at 15:26<br>
<b>To: </b>"<a href="mailto:users@ovirt.org">users@ovirt.org</a>" <<a href="mailto:users@ovirt.org">users@ovirt.org</a>><br>
<b>Subject: </b>[ovirt-users] Ovirt 4.0.6 guests 'Not Responding'</span><o:p></o:p></p>
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<p class="MsoNormal"><span style="font-family:"Times New Roman""> </span><o:p></o:p></p>
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<p class="MsoNormal">Hi,<o:p></o:p></p>
<p class="MsoNormal"> <o:p></o:p></p>
<p class="MsoNormal">Host server: Dell PowerEdge R815 (40 cores and 768GB memory)<o:p></o:p></p>
<p class="MsoNormal">Stoage: Dell Equallogic (Firmware V8.1.4)<o:p></o:p></p>
<p class="MsoNormal">OS: Centos 7.3 (although the same thing happens on 7.2)<o:p></o:p></p>
<p class="MsoNormal">Ovirt: 4.0.6.3-1<o:p></o:p></p>
<p class="MsoNormal"> <o:p></o:p></p>
<p class="MsoNormal">We have several Ovirt clusters. Two of the hosts (in separate clusters) are showing as up in Hosted Engine but the guests running on them are showing as Not Responding. I can connect to the guests via ssh, etc but can’t interact with them
from the Ovirt GUI. It was fine on Saturday (28<sup>th</sup> Jan) morning but looks like something happened Sunday morning around 07:14 as we suddenly see the following in engine.log on one host:<o:p></o:p></p>
<p class="MsoNormal"> <o:p></o:p></p>
<p class="MsoNormal">2017-01-29 07:14:26,952 INFO [org.ovirt.engine.core.vdsbroker.monitoring.VmAnalyzer] (DefaultQuartzScheduler1) [53ca8dc5] VM 'd0aa990f-e6aa-4e79-93ce-011fe1372fb0'(lnd-ion-lindev-01) moved from 'Up' --> 'NotResponding'<o:p></o:p></p>
<p class="MsoNormal">2017-01-29 07:14:27,069 WARN [org.ovirt.engine.core.dal.dbbroker.auditloghandling.AuditLogDirector] (DefaultQuartzScheduler1) [53ca8dc5] Correlation ID: null, Call Stack: null, Custom Event ID: -1, Message: VM lnd-ion-lindev-01 is not
responding.<o:p></o:p></p>
<p class="MsoNormal">2017-01-29 07:14:27,070 INFO [org.ovirt.engine.core.vdsbroker.monitoring.VmAnalyzer] (DefaultQuartzScheduler1) [53ca8dc5] VM '788bfc0e-1712-469e-9a0a-395b8bb3f369'(lnd-ion-windev-02) moved from 'Up' --> 'NotResponding'<o:p></o:p></p>
<p class="MsoNormal">2017-01-29 07:14:27,088 WARN [org.ovirt.engine.core.dal.dbbroker.auditloghandling.AuditLogDirector] (DefaultQuartzScheduler1) [53ca8dc5] Correlation ID: null, Call Stack: null, Custom Event ID: -1, Message: VM lnd-ion-windev-02 is not
responding.<o:p></o:p></p>
<p class="MsoNormal">2017-01-29 07:14:27,089 INFO [org.ovirt.engine.core.vdsbroker.monitoring.VmAnalyzer] (DefaultQuartzScheduler1) [53ca8dc5] VM 'd7eaa4ec-d65e-45c0-bc4f-505100658121'(lnd-ion-windev-04) moved from 'Up' --> 'NotResponding'<o:p></o:p></p>
<p class="MsoNormal">2017-01-29 07:14:27,103 WARN [org.ovirt.engine.core.dal.dbbroker.auditloghandling.AuditLogDirector] (DefaultQuartzScheduler1) [53ca8dc5] Correlation ID: null, Call Stack: null, Custom Event ID: -1, Message: VM lnd-ion-windev-04 is not
responding.<o:p></o:p></p>
<p class="MsoNormal">2017-01-29 07:14:27,104 INFO [org.ovirt.engine.core.vdsbroker.monitoring.VmAnalyzer] (DefaultQuartzScheduler1) [53ca8dc5] VM '5af875ad-70f9-4f49-9640-ee2b9927348b'(lnd-anv9-sup1) moved from 'Up' --> 'NotResponding'<o:p></o:p></p>
<p class="MsoNormal">2017-01-29 07:14:27,121 WARN [org.ovirt.engine.core.dal.dbbroker.auditloghandling.AuditLogDirector] (DefaultQuartzScheduler1) [53ca8dc5] Correlation ID: null, Call Stack: null, Custom Event ID: -1, Message: VM lnd-anv9-sup1 is not responding.<o:p></o:p></p>
<p class="MsoNormal">2017-01-29 07:14:27,121 INFO [org.ovirt.engine.core.vdsbroker.monitoring.VmAnalyzer] (DefaultQuartzScheduler1) [53ca8dc5] VM 'b3b7c5f3-0b5b-4d8f-9cc8-b758cc1ce3b9'(lnd-db-dev-03) moved from 'Up' --> 'NotResponding'<o:p></o:p></p>
<p class="MsoNormal">2017-01-29 07:14:27,136 WARN [org.ovirt.engine.core.dal.dbbroker.auditloghandling.AuditLogDirector] (DefaultQuartzScheduler1) [53ca8dc5] Correlation ID: null, Call Stack: null, Custom Event ID: -1, Message: VM lnd-db-dev-03 is not responding.<o:p></o:p></p>
<p class="MsoNormal">2017-01-29 07:14:27,137 INFO [org.ovirt.engine.core.vdsbroker.monitoring.VmAnalyzer] (DefaultQuartzScheduler1) [53ca8dc5] VM '6c0a6e17-47c3-4464-939b-e83984dbeaa6'(lnd-db-dev-04) moved from 'Up' --> 'NotResponding'<o:p></o:p></p>
<p class="MsoNormal">2017-01-29 07:14:27,167 WARN [org.ovirt.engine.core.dal.dbbroker.auditloghandling.AuditLogDirector] (DefaultQuartzScheduler1) [53ca8dc5] Correlation ID: null, Call Stack: null, Custom Event ID: -1, Message: VM lnd-db-dev-04 is not responding.<o:p></o:p></p>
<p class="MsoNormal">2017-01-29 07:14:27,168 INFO [org.ovirt.engine.core.vdsbroker.monitoring.VmAnalyzer] (DefaultQuartzScheduler1) [53ca8dc5] VM 'ab15bb08-1244-4dc1-a4f1-f6e94246aa23'(lnd-ion-lindev-05) moved from 'Up' --> 'NotResponding'<o:p></o:p></p>
<p class="MsoNormal"> <o:p></o:p></p>
<p class="MsoNormal"> <o:p></o:p></p>
<p class="MsoNormal">Checking the vdsm logs this morning on the hosts I see a lot of the following messages:<o:p></o:p></p>
<p class="MsoNormal"> <o:p></o:p></p>
<p class="MsoNormal">jsonrpc.Executor/0::WARNING::2017-01-30 09:34:15,989::vm::4890::virt.vm::(_setUnresponsiveIfTimeout) vmId=`ab15bb08-1244-4dc1-a4f1-f6e94246aa23`::monitor became unresponsive (command timeout, age=94854.48)<o:p></o:p></p>
<p class="MsoNormal">jsonrpc.Executor/0::WARNING::2017-01-30 09:34:15,990::vm::4890::virt.vm::(_setUnresponsiveIfTimeout) vmId=`20a51347-ef08-47a9-9982-32b2047991e1`::monitor became unresponsive (command timeout, age=94854.48)<o:p></o:p></p>
<p class="MsoNormal">jsonrpc.Executor/0::WARNING::2017-01-30 09:34:15,991::vm::4890::virt.vm::(_setUnresponsiveIfTimeout) vmId=`2cd8698d-a0f9-43b7-9a89-92a93e920eb7`::monitor became unresponsive (command timeout, age=94854.49)<o:p></o:p></p>
<p class="MsoNormal">jsonrpc.Executor/0::WARNING::2017-01-30 09:34:15,992::vm::4890::virt.vm::(_setUnresponsiveIfTimeout) vmId=`5af875ad-70f9-4f49-9640-ee2b9927348b`::monitor became unresponsive (command timeout, age=94854.49)<o:p></o:p></p>
<p class="MsoNormal"> <o:p></o:p></p>
<p class="MsoNormal">and<o:p></o:p></p>
<p class="MsoNormal"> <o:p></o:p></p>
<p class="MsoNormal">vdsm.Scheduler::WARNING::2017-01-30 09:36:36,444::periodic::212::virt.periodic.Operation::(_dispatch) could not run <VmDispatcher operation=<class 'vdsm.virt.periodic.DriveWatermarkMonitor'> at 0x295bd50>, executor queue full<o:p></o:p></p>
<p class="MsoNormal">vdsm.Scheduler::WARNING::2017-01-30 09:36:38,446::periodic::212::virt.periodic.Operation::(_dispatch) could not run <VmDispatcher operation=<class 'vdsm.virt.periodic.DriveWatermarkMonitor'> at 0x295bd50>, executor queue full<o:p></o:p></p>
<p class="MsoNormal">vdsm.Scheduler::WARNING::2017-01-30 09:36:38,627::periodic::212::virt.periodic.Operation::(_dispatch) could not run <vdsm.virt.sampling.HostMonitor object at 0x295bdd0>, executor queue full<o:p></o:p></p>
<p class="MsoNormal">vdsm.Scheduler::WARNING::2017-01-30 09:36:38,707::periodic::212::virt.periodic.Operation::(_dispatch) could not run <vdsm.virt.sampling.VMBulkSampler object at 0x295ba90>, executor queue full<o:p></o:p></p>
<p class="MsoNormal">vdsm.Scheduler::WARNING::2017-01-30 09:36:38,929::periodic::212::virt.periodic.Operation::(_dispatch) could not run <VmDispatcher operation=<class 'vdsm.virt.periodic.BlockjobMonitor'> at 0x295ba10>, executor queue full<o:p></o:p></p>
<p class="MsoNormal">vdsm.Scheduler::WARNING::2017-01-30 09:36:40,450::periodic::212::virt.periodic.Operation::(_dispatch) could not run <VmDispatcher operation=<class 'vdsm.virt.periodic.DriveWatermarkMonitor'> at 0x295bd50>, executor queue full<o:p></o:p></p>
<p class="MsoNormal">vdsm.Scheduler::WARNING::2017-01-30 09:36:42,451::periodic::212::virt.periodic.Operation::(_dispatch) could not run <VmDispatcher operation=<class 'vdsm.virt.periodic.DriveWatermarkMonitor'> at 0x295bd50>, executor queue full<o:p></o:p></p>
<p class="MsoNormal">vdsm.Scheduler::WARNING::2017-01-30 09:36:44,452::periodic::212::virt.periodic.Operation::(_dispatch) could not run <VmDispatcher operation=<class 'vdsm.virt.periodic.DriveWatermarkMonitor'> at 0x295bd50>, executor queue full<o:p></o:p></p>
<p class="MsoNormal"> <o:p></o:p></p>
<p class="MsoNormal">I’ve also attached logs from time period for one of the hosts in question. This host is in a single node DC and cluster with iSCSI shared storage. I’ve had to make the time window on the logs quite small to fit within the mail size limit.
Let me know if you need anything more specific.<o:p></o:p></p>
<p class="MsoNormal"> <o:p></o:p></p>
<p class="MsoNormal">Many Thanks,<o:p></o:p></p>
<p class="MsoNormal">Mark<o:p></o:p></p>
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