我正在开发CloudStack基础架构服务来构建我们的组织框架。 为此，正在使用RHEL 6.4（内核版本2.6.32），Cloudstack 4.2.1和KVM（版本0.12.1）。
我一直在努力找出下面提到的问题，但遗憾的是不能。
问题：快照永远停留在“正在创建”状态。
影响：因此无法获取快照，因此无法启动/停止CloudStack UI中的实例。
请参阅管理服务器日志中的以下跟踪，我认为这是其背后的原因。
me":"ROOT-13","path":"ec5692cb-7758-4618-b589-09cb71e45dba","size":21474836480,"type":"ROOT","storagePoolType":"NetworkFilesystem","storagePoolUuid":"d41d4103-a11d-3160-8a3b-6469c574a93f","deviceId":0},{"id":19,"name":"DATA-13","path":"8017ac65-b52b-450b-937f-d92178de2f34","size":21474836480,"type":"DATADISK","storagePoolType":"NetworkFilesystem","storagePoolUuid":"d41d4103-a11d-3160-8a3b-6469c574a93f","deviceId":1}],"target":{"id":13,"snapshotName":"i-2-13-VM_VS_20140225120244","type":"Disk","current":false,"description":"new"},"vmName":"i-2-13-VM","guestOSType":"Red Hat Enterprise Linux 6.4 (64-bit)","wait":1800}}] }
2014-02-25 17:32:45,254 DEBUG [agent.transport.Request] (AgentManager-Handler-11:null) Seq 1-2016739514: Processing: { Ans: , MgmtId: 181122461670954, via: 1, Ver: v1, Flags: 10, [{"com.cloud.agent.api.UnsupportedAnswer":{"result":false,"details":"Unsupported command issued:com.cloud.agent.api.CreateVMSnapshotCommand. Are you sure you got the right type of server?","wait":0}}] }
2014-02-25 17:32:45,254 DEBUG [agent.transport.Request] (Job-Executor-2:job-143 = [ 8ebc7ede-829d-473b-b909-a397f4c83490 ]) Seq 1-2016739514: Received: { Ans: , MgmtId: 181122461670954, via: 1, Ver: v1, Flags: 10, { UnsupportedAnswer } }
2014-02-25 17:32:45,254 WARN [agent.manager.AgentManagerImpl] (Job-Executor-2:job-143 = [ 8ebc7ede-829d-473b-b909-a397f4c83490 ]) Unsupported Command: Unsupported command issued:com.cloud.agent.api.CreateVMSnapshotCommand. Are you sure you got the right type of server?
2014-02-25 17:32:45,254 ERROR [vm.snapshot.VMSnapshotManagerImpl] (Job-Executor-2:job-143 = [ 8ebc7ede-829d-473b-b909-a397f4c83490 ]) Create vm snapshot i-2-13-VM_VS_20140225120244 failed for vm: i-2-13-VM due to com.cloud.agent.api.UnsupportedAnswer cannot be cast to com.cloud.agent.api.CreateVMSnapshotAnswer
2014-02-25 17:32:45,265 DEBUG [cloud.api.ApiServlet] (catalina-exec-11:null) ===START=== 192.168.125.241 -- GET command=listOsTypes&response=json&sessionkey=bP1MluiO7KMYb3krOwtD1IpG0b0%3D&_=1393329472271
2014-02-25 17:32:45,324 DEBUG [cloud.api.ApiServlet] (catalina-exec-13:null) ===START=== 192.168.125.241 -- GET command=listTags&response=json&sessionkey=bP1MluiO7KMYb3krOwtD1IpG0b0%3D&resourceId=340c69ae-f3a0-4966-aa0b-c799e944404f&resourceType=UserVm&listAll=true&_=1393329472305
2014-02-25 17:32:45,330 DEBUG [cloud.api.ApiServlet] (catalina-exec-13:null) ===END=== 192.168.125.241 -- GET command=listTags&response=json&sessionkey=bP1MluiO7KMYb3krOwtD1IpG0b0%3D&resourceId=340c69ae-f3a0-4966-aa0b-c799e944404f&resourceType=UserVm&listAll=true&_=1393329472305
2014-02-25 17:32:45,373 DEBUG [cloud.api.ApiServlet] (catalina-exec-11:null) ===END=== 192.168.125.241 -- GET command=listOsTypes&response=json&sessionkey=bP1MluiO7KMYb3krOwtD1IpG0b0%3D&_=1393329472271
2014-02-25 17:32:45,419 ERROR [cloud.async.AsyncJobManagerImpl] (Job-Executor-2:job-143 = [ 8ebc7ede-829d-473b-b909-a397f4c83490 ]) Unexpected exception while executing org.apache.cloudstack.api.command.user.vmsnapshot.CreateVMSnapshotCmd
com.cloud.utils.exception.CloudRuntimeException: com.cloud.agent.api.UnsupportedAnswer cannot be cast to com.cloud.agent.api.CreateVMSnapshotAnswer
at com.cloud.vm.snapshot.VMSnapshotManagerImpl.createVmSnapshotInternal(VMSnapshotManagerImpl.java:406)
at com.cloud.vm.snapshot.VMSnapshotManagerImpl.creatVMSnapshot(VMSnapshotManagerImpl.java:356)
at com.cloud.utils.component.ComponentInstantiationPostProcessor$InterceptorDispatcher.intercept(ComponentInstantiationPostProcessor.java:125)
at org.apache.cloudstack.api.command.user.vmsnapshot.CreateVMSnapshotCmd.execute(CreateVMSnapshotCmd.java:100)
at com.cloud.api.ApiDispatcher.dispatch(ApiDispatcher.java:158)
at com.cloud.async.AsyncJobManagerImpl$1.run(AsyncJobManagerImpl.java:531)
at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:471)
at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:334)
at java.util.concurrent.FutureTask.run(FutureTask.java:166)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1110)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:603)
at java.lang.Thread.run(Thread.java:722)
2014-02-25 17:32:45,420 DEBUG [cloud.async.AsyncJobManagerImpl] (Job-Executor-2:job-143 = [ 8ebc7ede-829d-473b-b909-a397f4c83490 ]) Complete async job-143 = [ 8ebc7ede-829d-473b-b909-a397f4c83490 ], jobStatus: 2, resultCode: 530, result: Error Code: 530 Error text: com.cloud.agent.api.UnsupportedAnswer cannot be cast to com.cloud.agent.api.CreateVMSnapshotAnswer
2014-02-25 17:32:50,526 DEBUG [storage.secondary.SecondaryStorageManagerImpl] (secstorage-1:null) Zone 1 is ready to launch secondary storage VM
2014-02-25 17:32:50,626 DEBUG [cloud.consoleproxy.ConsoleProxyManagerImpl] (consoleproxy-1:null) Zone 1 is ready to launch console proxy
2014-02-25 17:32:50,760 DEBUG [agent.manager.AgentManagerImpl] (AgentManager-Handler-14:null) SeqA 3-1596: Processing Seq 3-1596: { Cmd , MgmtId: -1, via: 3, Ver: v1, Flags: 11, [{"com.cloud.agent.api.ConsoleProxyLoadReportCommand":{"_proxyVmId":2,"_loadInfo":"{\n \"connections\": []\n}","wait":0}}] }
2014-02-25 17:32:50,835 DEBUG [agent.manager.AgentManagerImpl] (AgentManager-Handler-14:null) SeqA 3-1596: Sending Seq 3-1596: { Ans: , MgmtId: 181122461670954, via: 3, Ver: v1, Flags: 100010, [{"com.cloud.agent.api.AgentControlAnswer":{"result":true,"wait":0}}] }
2014-02-25 17:32:51,461 DEBUG [network.router.VirtualNetworkApplianceManagerImpl] (RouterStatusMonitor-1:null) Found 0 routers to update status.
2014-02-25 17:32:51,462 DEBUG [network.router.VirtualNetworkApplianceManagerImpl] (RouterStatusMonitor-1:null) Found 0 networks to update RvR status.
2014-02-25 17:32:54,001 DEBUG [agent.manager.AgentManagerImpl] (AgentManager-Handler-13:null) Ping from 3
2014-02-25 17:32:54,082 DEBUG [agent.manager.AgentManagerImpl] (AgentManager-Handler-12:null) Ping from 2
2014-02-25 17:32:54,340 DEBUG [agent.manager.AgentManagerImpl] (AgentManager-Handler-15:null) Ping from 1
2014-02-25 17:32:55,800 DEBUG [agent.manager.AgentManagerImpl] (AgentManager-Handler-2:null) SeqA 3-1598: Processing Seq 3-1598: { Cmd , MgmtId: -1, via: 3, Ver: v1, Flags: 11, [{"com.cloud.agent.api.ConsoleProxyLoadReportCommand":{"_proxyVmId":2,"_loadInfo":"{\n \"connections\": []\n}","wait":0}}] }
2014-02-25 17:32:55,945 DEBUG [agent.manager.AgentManagerImpl] (AgentManager-Handler-2:null) SeqA 3-1598: Sending Seq 3-1598: { Ans: , MgmtId: 181122461670954, via: 3, Ver: v1, Flags: 100010, [{"com.cloud.agent.api.AgentControlAnswer":{"result":true,"wait":0}}] }
2014-02-25 17:33:05,762 DEBUG [agent.manager.AgentManagerImpl] (AgentManager-Handler-1:null) SeqA 3-1599: Processing Seq 3-1599: { Cmd , MgmtId: -1, via: 3, Ver: v1, Flags: 11, [{"com.cloud.agent.api.ConsoleProxyLoadReportCommand":{"_proxyVmId":2,"_loadInfo":"{\n \"connections\": []\n}","wait":0}}] }
2014-02-25 17:33:05,847 DEBUG [agent.manager.AgentManagerImpl] (AgentManager-Handler-1:null) SeqA 3-1599: Sending Seq 3-1599: { Ans: , MgmtId: 181122461670954, via: 3, Ver: v1, Flags: 100010, [{"com.cloud.agent.api.AgentControlAnswer":{"result":true,"wait":0}}] }
2014-02-25 17:33:12,091 DEBUG [cloud.server.StatsCollector] (StatsCollector-1:null) VmStatsCollector is running...
2014-02-25 17:33:12,185 DEBUG [agent.transport.Request] (StatsCollector-1:null) Seq 1-2016739515: Received: { Ans: , MgmtId: 181122461670954, via: 1, Ver: v1, Flags: 10, { GetVmStatsAnswer } }
2014-02-25 17:33:13,400 DEBUG [cloud.server.StatsCollector] (StatsCollector-2:null) StorageCollector is running...
2014-02-25 17:33:13,460 DEBUG [agent.transport.Request] (StatsCollector-2:null) Seq 2-1323958339: Received: { Ans: , MgmtId: 181122461670954, via: 2, Ver: v1, Flags: 10, { GetStorageStatsAnswer } }
2014-02-25 17:33:13,500 DEBUG [agent.transport.Request] (StatsCollector-2:null) Seq 1-2016739516: Received: { Ans: , MgmtId: 181122461670954, via: 1, Ver: v1, Flags: 10, { GetStorageStatsAnswer } }
请参阅以下我在Cloudstack用户界面中点击Snapshot按钮时编写的代理日志中的跟踪：
2014-02-25 17:27:09,129 WARN [kvm.resource.LibvirtComputingResource] (agentRequest-Handler-4:null) Unsupported command
为了再次重启实例，我手动删除了与此卡住快照对应的mysql数据库中的表vm_snapshots中的行。
请为此问题向我提出正确解释。
提前致谢。
此致 罗希特夏尔