CS4.2.1添加过二级存储，里面已经有系统模版，系统虚拟会重复建，log中的异常是下面信息，给指点指点，CS4.0.2的环境测过 二级存储
是可以用的，系统虚拟正常启动，就CS4.2.1起不来，帮帮忙！！！！！！！！
2014-09-16 15:39:35,858 WARN [cloud.consoleproxy.ConsoleProxyManagerImpl]
(consoleproxy-1:null) Exception while trying to start console proxy
com.cloud.exception.AgentUnavailableException: Resource [Host:18] is
unreachable: Host 18: Unable to start instance due to null
at
com.cloud.vm.VirtualMachineManagerImpl.advanceStart(VirtualMachineManagerImpl.java:1010)
at
com.cloud.vm.VirtualMachineManagerImpl.start(VirtualMachineManagerImpl.java:587)
at
com.cloud.vm.VirtualMachineManagerImpl.start(VirtualMachineManagerImpl.java:580)
at
com.cloud.consoleproxy.ConsoleProxyManagerImpl.startProxy(ConsoleProxyManagerImpl.java:556)
at
com.cloud.consoleproxy.ConsoleProxyManagerImpl.allocCapacity(ConsoleProxyManagerImpl.java:928)
at
com.cloud.consoleproxy.ConsoleProxyManagerImpl.expandPool(ConsoleProxyManagerImpl.java:1672)
at
com.cloud.consoleproxy.ConsoleProxyManagerImpl.expandPool(ConsoleProxyManagerImpl.java:157)
at
com.cloud.vm.SystemVmLoadScanner.loadScan(SystemVmLoadScanner.java:111)
at
com.cloud.vm.SystemVmLoadScanner.access$100(SystemVmLoadScanner.java:33)
at
com.cloud.vm.SystemVmLoadScanner$1.reallyRun(SystemVmLoadScanner.java:81)
at com.cloud.vm.SystemVmLoadScanner$1.run(SystemVmLoadScanner.java:72)
at
java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:471)
at
java.util.concurrent.FutureTask$Sync.innerRunAndReset(FutureTask.java:351)
at java.util.concurrent.FutureTask.runAndReset(FutureTask.java:178)
at
java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:165)
at
java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:267)
at
java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1146)
at
java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
at java.lang.Thread.run(Thread.java:679)
Caused by: java.lang.NullPointerException
at
org.apache.cloudstack.storage.volume.VolumeServiceImpl.createBaseImageAsync(VolumeServiceImpl.java:428)
at
org.apache.cloudstack.storage.volume.VolumeServiceImpl.createVolumeFromTemplateAsync(VolumeServiceImpl.java:575)
at
com.cloud.storage.VolumeManagerImpl.recreateVolume(VolumeManagerImpl.java:2596)
at
com.cloud.storage.VolumeManagerImpl.prepare(VolumeManagerImpl.java:2660)
at
com.cloud.vm.VirtualMachineManagerImpl.advanceStart(VirtualMachineManagerImpl.java:899)
... 19 more
