Hi,
How to debug such problem ? All volumes exist and instances running, but can't to CentOS release 6.2 (Final) libvirt-0.9.4-23.el6_2.4.x86_64 libvirt-client-0.9.4-23.el6_2.4.x86_64 [root@kvmhost2 snapshot]# tail -10 /var/log/cloud/agent/agent.log com.cloud.utils.exception.CloudRuntimeException: org.libvirt.LibvirtException: Storage volume not found: no storage vol with matching name '/var/lib/libvirt/images/67033fb9-a432-4162-8b22-d8a7b2aeb100' at com.cloud.agent.storage.LibvirtStorageAdaptor.getVolume(LibvirtStorageAdaptor.java:81) ...cut... libvir: Storage error : Storage volume not found: no storage vol with matching name '/opt/primary/f5b97a37-f8dd-485c-945c-da31d20b9e23' ...cut... libvir: Storage error : Storage volume not found: no storage vol with matching name '/var/lib/libvirt/images/58ba9eed-c864-44f3-a987-9d1eaab182e1' [root@kvmhost2 snapshot]# tail -10 /var/log/cloud/agent/agent.log | awk '{print $15}' | xargs file /opt/primary/e371ebb7-8d9e-4c64-83e9-effea15a00e7: Qemu Image, Format: Qcow , Version: 2 /opt/primary/e371ebb7-8d9e-4c64-83e9-effea15a00e7: Qemu Image, Format: Qcow , Version: 2 /opt/primary/e55358fa-8dc5-4070-b3b6-3f4bc01b17ae: Qemu Image, Format: Qcow , Version: 2 /opt/primary/e55358fa-8dc5-4070-b3b6-3f4bc01b17ae: Qemu Image, Format: Qcow , Version: 2 /var/lib/libvirt/images/d49b318c-8bb4-4bb2-a897-1c40ef234d30: Qemu Image, Format: Qcow , Version: 2 /var/lib/libvirt/images/d49b318c-8bb4-4bb2-a897-1c40ef234d30: Qemu Image, Format: Qcow , Version: 2 /var/lib/libvirt/images/193c378c-80ba-4b82-affe-45c9da0ee839: Qemu Image, Format: Qcow , Version: 2 /var/lib/libvirt/images/193c378c-80ba-4b82-affe-45c9da0ee839: Qemu Image, Format: Qcow , Version: 2 /var/lib/libvirt/images/58ba9eed-c864-44f3-a987-9d1eaab182e1: Qemu Image, Format: Qcow , Version: 2 /var/lib/libvirt/images/58ba9eed-c864-44f3-a987-9d1eaab182e1: Qemu Image, Format: Qcow , Version: 2 When I'm try to start instance through UI I'm get the following error : UI Error pop-up : Resource [Host:34] is unreachable: Host 34: Unable to start instance due to Unable to get answer that is of class com.cloud.agent.api.StartAnswer Agent LOG : 2012-06-03 20:47:13,397 WARN [resource.computing.LibvirtComputingResource] (agentRequest-Handler-2:null) Exception com.cloud.utils.exception.CloudRuntimeException: org.libvirt.LibvirtException: Storage volume not found: no storage vol with matching name '/var/lib/libvirt/images/19d086dd-8229-48c2-aaa7-ea3d218dc5dc' at com.cloud.agent.storage.LibvirtStorageAdaptor.getVolume(LibvirtStorageAdaptor.java:81) at com.cloud.agent.storage.LibvirtStorageAdaptor.getPhysicalDisk(LibvirtStorageAdaptor.java:450) at com.cloud.agent.storage.LibvirtStoragePool.getPhysicalDisk(LibvirtStoragePool.java:104) at com.cloud.agent.resource.computing.LibvirtComputingResource.createVbd(LibvirtComputingResource.java:2593) at com.cloud.agent.resource.computing.LibvirtComputingResource.execute(LibvirtComputingResource.java:2510) at com.cloud.agent.resource.computing.LibvirtComputingResource.executeRequest(LibvirtComputingResource.java:985) at com.cloud.agent.Agent.processRequest(Agent.java:517) at com.cloud.agent.Agent$AgentRequestHandler.doTask(Agent.java:827) at com.cloud.utils.nio.Task.run(Task.java:79) at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1110) at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:603) at java.lang.Thread.run(Thread.java:679) 2012-06-03 20:47:13,399{GMT} WARN [cloud.agent.Agent] (agentRequest-Handler-2:) Caught: java.lang.NullPointerException at com.cloud.agent.resource.computing.LibvirtComputingResource.cleanupVMNetworks(LibvirtComputingResource.java:3664) at com.cloud.agent.resource.computing.LibvirtComputingResource.handleVmStartFailure(LibvirtComputingResource.java:2416) at com.cloud.agent.resource.computing.LibvirtComputingResource.execute(LibvirtComputingResource.java:2539) at com.cloud.agent.resource.computing.LibvirtComputingResource.executeRequest(LibvirtComputingResource.java:985) at com.cloud.agent.Agent.processRequest(Agent.java:517) at com.cloud.agent.Agent$AgentRequestHandler.doTask(Agent.java:827) at com.cloud.utils.nio.Task.run(Task.java:79) at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1110) at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:603) at java.lang.Thread.run(Thread.java:679) -- Serg