Solved:
there was a problem with the name resolution in some of the agents that did not allow them to mount one of the primary storage.




On 16/09/2016 10:52, Ugo Vasi wrote:
From the UI the SSVM appeared to be running and status of all agents was UP.

I tried to restart the SSVM but at reboot it gets stuck. I destroyed it and cloudstack automatically regenerated it without errors.

The problem persists in migration:

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....



On 16/09/2016 05:22, Abhinandan Prateek wrote:
 From UI check if your SSVM is Running and Agent state is Connected.




On 15/09/16, 3:39 PM, "Ugo Vasi" <ugo.v...@procne.it> wrote:

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
abhinandan.prat...@shapeblue.com
www.shapeblue.com
53 Chandos Place, Covent Garden, London  WC2N 4HSUK
@shapeblue








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