instance name already exists error when launch a new instance

    I launched 3 instances successfully, with nova.conf instance_name_template=newTest-%08x, so the instance names would be: newTest-00000001, newTest-00000002, newTest-00000003. (I'm using powervm for testing, but this situation may happen on other platforms, in my case, the instances are in the hypervisor, not on my computer)

    the problem is: when I restart my computer, without deleting the instances.
    and then rerun openstack and launch instance, with the same config file, error ocures:

2013-05-14 14:48:37 TRACE nova.openstack.common.rpc.amqp raise exception.InstanceExists(name=instance['name'])
2013-05-14 14:48:37 TRACE nova.openstack.common.rpc.amqp InstanceExists: Instance newTest-00000001 already exists.

 newTest-00000001 still exists in hypervisor, but the default name will set from newTest-00000001, conflict occurs. after 3 times of error launching, the name would be newTest-00000004, then the fouth time of launching will success.

  I know it is because when my computer shut down, the data store in database would be lost, but the instances launched before would still in the hypervisor, so next time the openstack running, the local database is clean, and the instance name will begin with newTest-00000001, and confict with the instance name on the hypervisor.

  but does anyone know how to fix this problem, without deleting everthing I launched in the hypervisor? is this a bug? or I've done something wrong?