When I attche a volume to a linux instance, the log of nova-compute output that:
2012-07-15 20:10:01 AUDIT nova.compute.manager [req-3442f582-84a0-45e8-ab2b-b4e19991c309 6e0e80b8cfd44405827cebe6c10378a6 9815531badab45a2a1b27f14ec9a5497] [instance: 8dfbb4f2-246e-4286-be07-338c8a876876] Attaching volume 215b4b89-0127-4cbe-b09b-be5b770d7a2b to /dev/vdc
2012-07-15 20:10:03 INFO nova.virt.libvirt.driver [-] Compute_service record updated for op3
2012-07-15 20:10:03 INFO nova.compute.manager [-] Updating host status
2012-07-15 20:10:03 WARNING nova.virt.libvirt.volume [req-3442f582-84a0-45e8-ab2b-b4e19991c309 6e0e80b8cfd44405827cebe6c10378a6 9815531badab45a2a1b27f14ec9a5497] ISCSI volume not yet found at: vdc. Will rescan & retry. Try number: 0
2012-07-15 20:10:17 ERROR nova.compute.manager [req-3442f582-84a0-45e8-ab2b-b4e19991c309 6e0e80b8cfd44405827cebe6c10378a6 9815531badab45a2a1b27f14ec9a5497] [instance: 8dfbb4f2-246e-4286-be07-338c8a876876] Failed to attach volume 215b4b89-0127-4cbe-b09b-be5b770d7a2b at /dev/vdc
2012-07-15 20:10:17 TRACE nova.compute.manager [instance: 8dfbb4f2-246e-4286-be07-338c8a876876] Traceback (most recent call last):
2012-07-15 20:10:17 TRACE nova.compute.manager [instance: 8dfbb4f2-246e-4286-be07-338c8a876876] File "/usr/local/lib/python2.7/dist-packages/nova-2012.2-py2.7.egg/nova/compute/manager.py", line 1816, in attach_volume
2012-07-15 20:10:17 TRACE nova.compute.manager [instance: 8dfbb4f2-246e-4286-be07-338c8a876876] mountpoint)
2012-07-15 20:10:17 TRACE nova.compute.manager [instance: 8dfbb4f2-246e-4286-be07-338c8a876876] File "/usr/local/lib/python2.7/dist-packages/nova-2012.2-py2.7.egg/nova/exception.py", line 117, in wrapped
2012-07-15 20:10:17 TRACE nova.compute.manager [instance: 8dfbb4f2-246e-4286-be07-338c8a876876] temp_level, payload)
2012-07-15 20:10:17 TRACE nova.compute.manager [instance: 8dfbb4f2-246e-4286-be07-338c8a876876] File "/usr/lib/python2.7/contextlib.py", line 24, in __exit__
2012-07-15 20:10:17 TRACE nova.compute.manager [instance: 8dfbb4f2-246e-4286-be07-338c8a876876] self.gen.next()
2012-07-15 20:10:17 TRACE nova.compute.manager [instance: 8dfbb4f2-246e-4286-be07-338c8a876876] File "/usr/local/lib/python2.7/dist-packages/nova-2012.2-py2.7.egg/nova/exception.py", line 92, in wrapped
2012-07-15 20:10:17 TRACE nova.compute.manager [instance: 8dfbb4f2-246e-4286-be07-338c8a876876] return f(*args, **kw)
2012-07-15 20:10:17 TRACE nova.compute.manager [instance: 8dfbb4f2-246e-4286-be07-338c8a876876] File "/usr/local/lib/python2.7/dist-packages/nova-2012.2-py2.7.egg/nova/virt/libvirt/driver.py", line 633, in attach_volume
2012-07-15 20:10:17 TRACE nova.compute.manager [instance: 8dfbb4f2-246e-4286-be07-338c8a876876] raise
2012-07-15 20:10:17 TRACE nova.compute.manager [instance: 8dfbb4f2-246e-4286-be07-338c8a876876] TypeError: exceptions must be old-style classes or derived from BaseException, not NoneType
2012-07-15 20:10:17 TRACE nova.compute.manager [instance: 8dfbb4f2-246e-4286-be07-338c8a876876]
2012-07-15 20:10:17 ERROR nova.openstack.common.rpc.amqp [-] Exception during message handling
2012-07-15 20:10:17 TRACE nova.openstack.common.rpc.amqp Traceback (most recent call last):
2012-07-15 20:10:17 TRACE nova.openstack.common.rpc.amqp File "/usr/local/lib/python2.7/dist-packages/nova-2012.2-py2.7.egg/nova/openstack/common/rpc/amqp.py", line 275, in _process_data
2012-07-15 20:10:17 TRACE nova.openstack.common.rpc.amqp rval = self.proxy.dispatch(ctxt, version, method, **args)
2012-07-15 20:10:17 TRACE nova.openstack.common.rpc.amqp File "/usr/local/lib/python2.7/dist-packages/nova-2012.2-py2.7.egg/nova/openstack/common/rpc/dispatcher.py", line 145, in dispatch
2012-07-15 20:10:17 TRACE nova.openstack.common.rpc.amqp return getattr(proxyobj, method)(ctxt, **kwargs)
2012-07-15 20:10:17 TRACE nova.openstack.common.rpc.amqp File "/usr/local/lib/python2.7/dist-packages/nova-2012.2-py2.7.egg/nova/exception.py", line 117, in wrapped
2012-07-15 20:10:17 TRACE nova.openstack.common.rpc.amqp temp_level, payload)
2012-07-15 20:10:17 TRACE nova.openstack.common.rpc.amqp File "/usr/lib/python2.7/contextlib.py", line 24, in __exit__
2012-07-15 20:10:17 TRACE nova.openstack.common.rpc.amqp self.gen.next()
2012-07-15 20:10:17 TRACE nova.openstack.common.rpc.amqp File "/usr/local/lib/python2.7/dist-packages/nova-2012.2-py2.7.egg/nova/exception.py", line 92, in wrapped
2012-07-15 20:10:17 TRACE nova.openstack.common.rpc.amqp return f(*args, **kw)
2012-07-15 20:10:17 TRACE nova.openstack.common.rpc.amqp File "/usr/local/lib/python2.7/dist-packages/nova-2012.2-py2.7.egg/nova/compute/manager.py", line 184, in decorated_function
2012-07-15 20:10:17 TRACE nova.openstack.common.rpc.amqp function(self, context, instance_uuid, *args, **kwargs)
2012-07-15 20:10:17 TRACE nova.openstack.common.rpc.amqp File "/usr/local/lib/python2.7/dist-packages/nova-2012.2-py2.7.egg/nova/compute/manager.py", line 208, in decorated_function
2012-07-15 20:10:17 TRACE nova.openstack.common.rpc.amqp sys.exc_info())
2012-07-15 20:10:17 TRACE nova.openstack.common.rpc.amqp File "/usr/lib/python2.7/contextlib.py", line 24, in __exit__
2012-07-15 20:10:17 TRACE nova.openstack.common.rpc.amqp self.gen.next()
2012-07-15 20:10:17 TRACE nova.openstack.common.rpc.amqp File "/usr/local/lib/python2.7/dist-packages/nova-2012.2-py2.7.egg/nova/compute/manager.py", line 202, in decorated_function
2012-07-15 20:10:17 TRACE nova.openstack.common.rpc.amqp return function(self, context, instance_uuid, *args, **kwargs)
2012-07-15 20:10:17 TRACE nova.openstack.common.rpc.amqp File "/usr/local/lib/python2.7/dist-packages/nova-2012.2-py2.7.egg/nova/compute/manager.py", line 1825, in attach_volume
2012-07-15 20:10:17 TRACE nova.openstack.common.rpc.amqp connector)
2012-07-15 20:10:17 TRACE nova.openstack.common.rpc.amqp File "/usr/lib/python2.7/contextlib.py", line 24, in __exit__
2012-07-15 20:10:17 TRACE nova.openstack.common.rpc.amqp self.gen.next()
2012-07-15 20:10:17 TRACE nova.openstack.common.rpc.amqp File "/usr/local/lib/python2.7/dist-packages/nova-2012.2-py2.7.egg/nova/compute/manager.py", line 1816, in attach_volume
2012-07-15 20:10:17 TRACE nova.openstack.common.rpc.amqp mountpoint)
2012-07-15 20:10:17 TRACE nova.openstack.common.rpc.amqp File "/usr/local/lib/python2.7/dist-packages/nova-2012.2-py2.7.egg/nova/exception.py", line 117, in wrapped
2012-07-15 20:10:17 TRACE nova.openstack.common.rpc.amqp temp_level, payload)
2012-07-15 20:10:17 TRACE nova.openstack.common.rpc.amqp File "/usr/lib/python2.7/contextlib.py", line 24, in __exit__
2012-07-15 20:10:17 TRACE nova.openstack.common.rpc.amqp self.gen.next()
2012-07-15 20:10:17 TRACE nova.openstack.common.rpc.amqp File "/usr/local/lib/python2.7/dist-packages/nova-2012.2-py2.7.egg/nova/exception.py", line 92, in wrapped
2012-07-15 20:10:17 TRACE nova.openstack.common.rpc.amqp return f(*args, **kw)
2012-07-15 20:10:17 TRACE nova.openstack.common.rpc.amqp File "/usr/local/lib/python2.7/dist-packages/nova-2012.2-py2.7.egg/nova/virt/libvirt/driver.py", line 633, in attach_volume
2012-07-15 20:10:17 TRACE nova.openstack.common.rpc.amqp raise
2012-07-15 20:10:17 TRACE nova.openstack.common.rpc.amqp TypeError: exceptions must be old-style classes or derived from BaseException, not NoneType
2012-07-15 20:10:17 TRACE nova.openstack.common.rpc.amqp
