Hi all,
manually migrating some VMs from one host to another in anticipation of a maintenance, we were stopped by an error that does not allow us to migrate any other VMs. We moved two VMs without problems and, after migrating the Secondary Storage VM it's now no longer possible to migrate further VMs due to the following error:



2016-09-15 11:50:59,744 ERROR [c.c.v.VmWorkJobHandlerProxy] (Work-Job-Executor-154:ctx-b85c4d66 job-1943/job-1944 ctx-fb8615d0) Invocation exception, caused by: com.cloud.exception.AgentUnavailableException: Resource [Host:6] is unreachable: Host 6: Unable to prepare for migration due to com.cloud.utils.exception.CloudRuntimeException: Could not fetch storage pool 35620029-6800-38f4-8e7b-5ab68cc194ee from libvirt at com.cloud.hypervisor.kvm.storage.KVMStoragePoolManager.getStoragePool(KVMStoragePoolManager.java:212)
 (snipped)

2016-09-15 11:50:59,746 INFO [c.c.v.VmWorkJobHandlerProxy] (Work-Job-Executor-154:ctx-b85c4d66 job-1943/job-1944 ctx-fb8615d0) Rethrow exception com.cloud.exception.AgentUnavailableException: Resource [Host:6] is unreachable: Host 6: Unable to prepare for migration due to com.cloud.utils.exception.CloudRuntimeException: Could not fetch storage pool 35620029-6800-38f4-8e7b-5ab68cc194ee from libvirt at com.cloud.hypervisor.kvm.storage.KVMStoragePoolManager.getStoragePool(KVMStoragePoolManager.java:212)
 (snipped)

2016-09-15 11:50:59,746 DEBUG [c.c.v.VmWorkJobDispatcher] (Work-Job-Executor-154:ctx-b85c4d66 job-1943/job-1944) Done with run of VM work job: com.cloud.vm.VmWorkMigrate for VM 78, job origin: 1943


Our configuration is:
Cloudstack 4.5.2 on Ubuntu 14.04

Thanks in advance

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