Confirmed, following the steps described in the bug and i got the error in nova-compute.log: `Stderr: u'blockdev: cannot open xxx` details below. But `/dev/disk/by-path/ip-192.168.70.11:3260-iscsi-iqn.2010-10.org.openstack:volume-08bc45cb-e570-44a7-8619-6f575575369c-lun-1` could be found by `ls /dev/disk/by-path`.. even disk config exists by 'virsh dumpxml <domain>' .. After resuming the instance, `virsh dumpxml <domain>` couldn't found the disk config anymore, but `/dev/disk/by-path/xxxx` still exists.

2015-04-01 13:03:37.597 ERROR nova.openstack.common.periodic_task [-] Error during ComputeManager.update_available_resource: Unexpected error while running command.
Command: sudo nova-rootwrap /etc/nova/rootwrap.conf blockdev --getsize64 /dev/disk/by-path/ip-192.168.70.11:3260-iscsi-iqn.2010-10.org.openstack:volume-08bc45cb-e570-44a7-8619-6f575575369c-lun-1
Exit code: 1
Stdout: u''
Stderr: u'blockdev: cannot open /dev/disk/by-path/ip-192.168.70.11:3260-iscsi-iqn.2010-10.org.openstack:volume-08bc45cb-e570-44a7-8619-6f575575369c-lun-1: No such device or address\n'
2015-04-01 13:03:37.597 TRACE nova.openstack.common.periodic_task Traceback (most recent call last):
2015-04-01 13:03:37.597 TRACE nova.openstack.common.periodic_task   File "/data/stack/nova/nova/openstack/common/periodic_task.py", line 224, in run_periodic_tasks
2015-04-01 13:03:37.597 TRACE nova.openstack.common.periodic_task     task(self, context)
2015-04-01 13:03:37.597 TRACE nova.openstack.common.periodic_task   File "/data/stack/nova/nova/compute/manager.py", line 6067, in update_available_resource
2015-04-01 13:03:37.597 TRACE nova.openstack.common.periodic_task     rt.update_available_resource(context)
2015-04-01 13:03:37.597 TRACE nova.openstack.common.periodic_task   File "/data/stack/nova/nova/compute/resource_tracker.py", line 315, in update_available_resource
2015-04-01 13:03:37.597 TRACE nova.openstack.common.periodic_task     resources = self.driver.get_available_resource(self.nodename)
2015-04-01 13:03:37.597 TRACE nova.openstack.common.periodic_task   File "/data/stack/nova/nova/virt/libvirt/driver.py", line 4875, in get_available_resource
2015-04-01 13:03:37.597 TRACE nova.openstack.common.periodic_task     disk_over_committed = self._get_disk_over_committed_size_total()
2015-04-01 13:03:37.597 TRACE nova.openstack.common.periodic_task   File "/data/stack/nova/nova/virt/libvirt/driver.py", line 6056, in _get_disk_over_committed_size_total
2015-04-01 13:03:37.597 TRACE nova.openstack.common.periodic_task     self._get_instance_disk_info(dom.name(), xml))
2015-04-01 13:03:37.597 TRACE nova.openstack.common.periodic_task   File "/data/stack/nova/nova/virt/libvirt/driver.py", line 6009, in _get_instance_disk_info
2015-04-01 13:03:37.597 TRACE nova.openstack.common.periodic_task     dk_size = lvm.get_volume_size(path)
2015-04-01 13:03:37.597 TRACE nova.openstack.common.periodic_task   File "/data/stack/nova/nova/virt/libvirt/lvm.py", line 172, in get_volume_size
2015-04-01 13:03:37.597 TRACE nova.openstack.common.periodic_task     run_as_root=True)
2015-04-01 13:03:37.597 TRACE nova.openstack.common.periodic_task   File "/data/stack/nova/nova/virt/libvirt/utils.py", line 55, in execute
2015-04-01 13:03:37.597 TRACE nova.openstack.common.periodic_task     return utils.execute(*args, **kwargs)
2015-04-01 13:03:37.597 TRACE nova.openstack.common.periodic_task   File "/data/stack/nova/nova/utils.py", line 199, in execute
2015-04-01 13:03:37.597 TRACE nova.openstack.common.periodic_task     return processutils.execute(*cmd, **kwargs)
2015-04-01 13:03:37.597 TRACE nova.openstack.common.periodic_task   File "/usr/local/lib/python2.7/dist-packages/oslo_concurrency/processutils.py", line 233, in execute
2015-04-01 13:03:37.597 TRACE nova.openstack.common.periodic_task     cmd=sanitized_cmd)
2015-04-01 13:03:37.597 TRACE nova.openstack.common.periodic_task ProcessExecutionError: Unexpected error while running command.
2015-04-01 13:03:37.597 TRACE nova.openstack.common.periodic_task Command: sudo nova-rootwrap /etc/nova/rootwrap.conf blockdev --getsize64 /dev/disk/by-path/ip-192.168.70.11:3260-iscsi-iqn.2010-10.org.openstack:volume-08bc45cb-e570-44a7-8619-6f575575369c-lun-1
2015-04-01 13:03:37.597 TRACE nova.openstack.common.periodic_task Exit code: 1
2015-04-01 13:03:37.597 TRACE nova.openstack.common.periodic_task Stdout: u''
2015-04-01 13:03:37.597 TRACE nova.openstack.common.periodic_task Stderr: u'blockdev: cannot open /dev/disk/by-path/ip-192.168.70.11:3260-iscsi-iqn.2010-10.org.openstack:volume-08bc45cb-e570-44a7-8619-6f575575369c-lun-1: No such device or address\n'