问题描述：
Cloudstack4.0集成KVM，可以正常添加主机，并且可以正常操作到ZONE启用，但是到系统VM启动的时候就开始报错，报异常。
`/mnt/xx': Invalid argument
Cloudstack Management:
/var/log/cloud/management/management-server.log
2013-08-14 03:09:09,161 DEBUG [cloud.consoleproxy.ConsoleProxyManagerImpl] (consoleproxy-1:null) Skip capacity scan due to there is no Primary Storage UPintenance mode
1993 2013-08-14 03:09:09,721 DEBUG [network.router.VirtualNetworkApplianceManagerImpl] (RouterStatusMonitor-1:null) Found 0 routers.
1994 2013-08-14 03:09:25,572 DEBUG [cloud.server.StatsCollector] (StatsCollector-1:null) VmStatsCollector is running...
1995 2013-08-14 03:09:25,587 DEBUG [cloud.server.StatsCollector] (StatsCollector-3:null) StorageCollector is running...
1996 2013-08-14 03:09:25,589 DEBUG [cloud.server.StatsCollector] (StatsCollector-1:null) HostStatsCollector is running...
1997 2013-08-14 03:09:39,160 DEBUG [cloud.consoleproxy.ConsoleProxyManagerImpl] (consoleproxy-1:null) Skip capacity scan due to there is no Primary Storage UPintenance mode
1998 2013-08-14 03:09:39,721 DEBUG [network.router.VirtualNetworkApplianceManagerImpl] (RouterStatusMonitor-1:null) Found 0 routers
2013-08-13 15:28:01,634 WARN [cloud.consoleproxy.ConsoleProxyManagerImpl] (consoleproxy-1:null) Exception while trying to start console proxy
9023 com.cloud.exception.AgentUnavailableException: Resource [Host:1] is unreachable: Host 1: Unable to start instance due to Unable to get answer that is of class com.cloud.agent.api.Star tAnswer
9024 at com.cloud.vm.VirtualMachineManagerImpl.advanceStart(VirtualMachineManagerImpl.java:847)
9025 at com.cloud.vm.VirtualMachineManagerImpl.start(VirtualMachineManagerImpl.java:472)
9026 at com.cloud.vm.VirtualMachineManagerImpl.start(VirtualMachineManagerImpl.java:465)
9027 at com.cloud.consoleproxy.ConsoleProxyManagerImpl.startProxy(ConsoleProxyManagerImpl.java:627)
9028 at com.cloud.consoleproxy.ConsoleProxyManagerImpl.allocCapacity(ConsoleProxyManagerImpl.java:1164)
9029 at com.cloud.consoleproxy.ConsoleProxyManagerImpl.expandPool(ConsoleProxyManagerImpl.java:1981)
9030 at com.cloud.consoleproxy.ConsoleProxyManagerImpl.expandPool(ConsoleProxyManagerImpl.java:173)
9031 at com.cloud.vm.SystemVmLoadScanner.loadScan(SystemVmLoadScanner.java:113)
9032 at com.cloud.vm.SystemVmLoadScanner.access$100(SystemVmLoadScanner.java:34)
9033 at com.cloud.vm.SystemVmLoadScanner$1.reallyRun(SystemVmLoadScanner.java:83)
9034 at com.cloud.vm.SystemVmLoadScanner$1.run(SystemVmLoadScanner.java:73)
9035 at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:471)
9036 at java.util.concurrent.FutureTask$Sync.innerRunAndReset(FutureTask.java:351)
9037 at java.util.concurrent.FutureTask.runAndReset(FutureTask.java:178)
9038 at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:165)
9039 at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:267)
9040 at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1110)
9041 at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:603)
9042 at java.lang.Thread.run(Thread.java:679)
9043 Caused by: com.cloud.utils.exception.CloudRuntimeException: Unable to get answer that is of class com.cloud.agent.api.StartAnswer
9044 at com.cloud.agent.manager.Commands.getAnswer(Commands.java:80)
9045 at com.cloud.vm.VirtualMachineManagerImpl.advanceStart(VirtualMachineManagerImpl.java:783)
9046 ... 19 more
KVM Host(Cloudstack Aent)：
/var/log/cloud/agent/agent.log
com.cloud.utils.exception.CloudRuntimeException: org.libvirt.LibvirtException: cannot create path '/mnt/2c65613e-e5a3-3443-96c9-272fd60502ee/v-2-VM-patchdisk': Invalid argument
at com.cloud.hypervisor.kvm.storage.LibvirtStorageAdaptor.createPhysicalDisk(LibvirtStorageAdaptor.java:556)
at com.cloud.hypervisor.kvm.storage.LibvirtStoragePool.createPhysicalDisk(LibvirtStoragePool.java:101)
at com.cloud.hypervisor.kvm.resource.LibvirtComputingResource.createPatchVbd(LibvirtComputingResource.java:2980)
at com.cloud.hypervisor.kvm.resource.LibvirtComputingResource.createVbd(LibvirtComputingResource.java:2943)
at com.cloud.hypervisor.kvm.resource.LibvirtComputingResource.execute(LibvirtComputingResource.java:2808)
at com.cloud.hypervisor.kvm.resource.LibvirtComputingResource.executeRequest(LibvirtComputingResource.java:1035)
at com.cloud.agent.Agent.processRequest(Agent.java:518)
at com.cloud.agent.Agent$AgentRequestHandler.doTask(Agent.java:831)
at com.cloud.utils.nio.Task.run(Task.java:83)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1110)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:603)
at java.lang.Thread.run(Thread.java:679)
2013-08-13 17:41:17,886 WARN [cloud.agent.Agent] (agentRequest-Handler-2:null) Caught:
java.lang.NullPointerException
at com.cloud.hypervisor.kvm.resource.LibvirtComputingResource.cleanupVMNetworks(LibvirtComputingResource.java:3922)
at com.cloud.hypervisor.kvm.resource.LibvirtComputingResource.handleVmStartFailure(LibvirtComputingResource.java:2709)
at com.cloud.hypervisor.kvm.resource.LibvirtComputingResource.execute(LibvirtComputingResource.java:2834)
at com.cloud.hypervisor.kvm.resource.LibvirtComputingResource.executeRequest(LibvirtComputingResource.java:1035)
at com.cloud.agent.Agent.processRequest(Agent.java:518)
at com.cloud.agent.Agent$AgentRequestHandler.doTask(Agent.java:831)
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