Public bug reported:
During an attach to an iSCSI device, the LUN may not appear as soon as
the path which contains the LUNs. The XenAPI code copes with multiple
(or no) LUNs for an SR, so there is a race condition where the SR is
created but no VDIs are registered, leading to the following exception:
2014-01-29 08:19:41.804 ERROR nova.compute.manager
[req-144fa10e-7003-45dc-a54c-f45b1b3581fd
tempest.scenario.manager-tempest-1638977579-user
tempest.scenario.manager-tempest-1638977579-tenant] [instance:
cc864540-8650-40ea-9142-ba533c1e39f9] Failed to attach volume
2ac02e92-8880-4bd7-a382-8942ffe14f7c at /dev/xvdb
2014-01-29 08:19:41.804 TRACE nova.compute.manager [instance:
cc864540-8650-40ea-9142-ba533c1e39f9] Traceback (most recent call last):
2014-01-29 08:19:41.804 TRACE nova.compute.manager [instance:
cc864540-8650-40ea-9142-ba533c1e39f9] File
"/opt/stack/nova/nova/compute/manager.py", line 3852, in _attach_volume
2014-01-29 08:19:41.804 TRACE nova.compute.manager [instance:
cc864540-8650-40ea-9142-ba533c1e39f9] encryption=encryption)
2014-01-29 08:19:41.804 TRACE nova.compute.manager [instance:
cc864540-8650-40ea-9142-ba533c1e39f9] File
"/opt/stack/nova/nova/virt/xenapi/driver.py", line 435, in attach_volume
2014-01-29 08:19:41.804 TRACE nova.compute.manager [instance:
cc864540-8650-40ea-9142-ba533c1e39f9] mountpoint)
2014-01-29 08:19:41.804 TRACE nova.compute.manager [instance:
cc864540-8650-40ea-9142-ba533c1e39f9] File
"/opt/stack/nova/nova/virt/xenapi/volumeops.py", line 59, in attach_volume
2014-01-29 08:19:41.804 TRACE nova.compute.manager [instance:
cc864540-8650-40ea-9142-ba533c1e39f9] hotplug=hotplug)
2014-01-29 08:19:41.804 TRACE nova.compute.manager [instance:
cc864540-8650-40ea-9142-ba533c1e39f9] File
"/opt/stack/nova/nova/virt/xenapi/volumeops.py", line 130, in _connect_volume
2014-01-29 08:19:41.804 TRACE nova.compute.manager [instance:
cc864540-8650-40ea-9142-ba533c1e39f9] volume_utils.forget_sr(self._session,
sr_ref)
2014-01-29 08:19:41.804 TRACE nova.compute.manager [instance:
cc864540-8650-40ea-9142-ba533c1e39f9] File
"/opt/stack/nova/nova/openstack/common/excutils.py", line 68, in __exit__
2014-01-29 08:19:41.804 TRACE nova.compute.manager [instance:
cc864540-8650-40ea-9142-ba533c1e39f9] six.reraise(self.type_, self.value,
self.tb)
2014-01-29 08:19:41.804 TRACE nova.compute.manager [instance:
cc864540-8650-40ea-9142-ba533c1e39f9] File
"/opt/stack/nova/nova/virt/xenapi/volumeops.py", line 108, in _connect_volume
2014-01-29 08:19:41.804 TRACE nova.compute.manager [instance:
cc864540-8650-40ea-9142-ba533c1e39f9]
target_lun=connection_data['target_lun'])
2014-01-29 08:19:41.804 TRACE nova.compute.manager [instance:
cc864540-8650-40ea-9142-ba533c1e39f9] File
"/opt/stack/nova/nova/virt/xenapi/volume_utils.py", line 160, in introduce_vdi
2014-01-29 08:19:41.804 TRACE nova.compute.manager [instance:
cc864540-8650-40ea-9142-ba533c1e39f9] vdi_rec =
session.call_xenapi("VDI.get_record", vdi_ref)
2014-01-29 08:19:41.804 TRACE nova.compute.manager [instance:
cc864540-8650-40ea-9142-ba533c1e39f9] UnboundLocalError: local variable
'vdi_ref' referenced before assignment
** Affects: nova
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/1274088
Title:
XenAPI: iscsi connection may not show VDI during attach
Status in OpenStack Compute (Nova):
New
Bug description:
During an attach to an iSCSI device, the LUN may not appear as soon as
the path which contains the LUNs. The XenAPI code copes with multiple
(or no) LUNs for an SR, so there is a race condition where the SR is
created but no VDIs are registered, leading to the following
exception:
2014-01-29 08:19:41.804 ERROR nova.compute.manager
[req-144fa10e-7003-45dc-a54c-f45b1b3581fd
tempest.scenario.manager-tempest-1638977579-user
tempest.scenario.manager-tempest-1638977579-tenant] [instance:
cc864540-8650-40ea-9142-ba533c1e39f9] Failed to attach volume
2ac02e92-8880-4bd7-a382-8942ffe14f7c at /dev/xvdb
2014-01-29 08:19:41.804 TRACE nova.compute.manager [instance:
cc864540-8650-40ea-9142-ba533c1e39f9] Traceback (most recent call last):
2014-01-29 08:19:41.804 TRACE nova.compute.manager [instance:
cc864540-8650-40ea-9142-ba533c1e39f9] File
"/opt/stack/nova/nova/compute/manager.py", line 3852, in _attach_volume
2014-01-29 08:19:41.804 TRACE nova.compute.manager [instance:
cc864540-8650-40ea-9142-ba533c1e39f9] encryption=encryption)
2014-01-29 08:19:41.804 TRACE nova.compute.manager [instance:
cc864540-8650-40ea-9142-ba533c1e39f9] File
"/opt/stack/nova/nova/virt/xenapi/driver.py", line 435, in attach_volume
2014-01-29 08:19:41.804 TRACE nova.compute.manager [instance:
cc864540-8650-40ea-9142-ba533c1e39f9] mountpoint)
2014-01-29 08:19:41.804 TRACE nova.compute.manager [instance:
cc864540-8650-40ea-9142-ba533c1e39f9] File
"/opt/stack/nova/nova/virt/xenapi/volumeops.py", line 59, in attach_volume
2014-01-29 08:19:41.804 TRACE nova.compute.manager [instance:
cc864540-8650-40ea-9142-ba533c1e39f9] hotplug=hotplug)
2014-01-29 08:19:41.804 TRACE nova.compute.manager [instance:
cc864540-8650-40ea-9142-ba533c1e39f9] File
"/opt/stack/nova/nova/virt/xenapi/volumeops.py", line 130, in _connect_volume
2014-01-29 08:19:41.804 TRACE nova.compute.manager [instance:
cc864540-8650-40ea-9142-ba533c1e39f9] volume_utils.forget_sr(self._session,
sr_ref)
2014-01-29 08:19:41.804 TRACE nova.compute.manager [instance:
cc864540-8650-40ea-9142-ba533c1e39f9] File
"/opt/stack/nova/nova/openstack/common/excutils.py", line 68, in __exit__
2014-01-29 08:19:41.804 TRACE nova.compute.manager [instance:
cc864540-8650-40ea-9142-ba533c1e39f9] six.reraise(self.type_, self.value,
self.tb)
2014-01-29 08:19:41.804 TRACE nova.compute.manager [instance:
cc864540-8650-40ea-9142-ba533c1e39f9] File
"/opt/stack/nova/nova/virt/xenapi/volumeops.py", line 108, in _connect_volume
2014-01-29 08:19:41.804 TRACE nova.compute.manager [instance:
cc864540-8650-40ea-9142-ba533c1e39f9]
target_lun=connection_data['target_lun'])
2014-01-29 08:19:41.804 TRACE nova.compute.manager [instance:
cc864540-8650-40ea-9142-ba533c1e39f9] File
"/opt/stack/nova/nova/virt/xenapi/volume_utils.py", line 160, in introduce_vdi
2014-01-29 08:19:41.804 TRACE nova.compute.manager [instance:
cc864540-8650-40ea-9142-ba533c1e39f9] vdi_rec =
session.call_xenapi("VDI.get_record", vdi_ref)
2014-01-29 08:19:41.804 TRACE nova.compute.manager [instance:
cc864540-8650-40ea-9142-ba533c1e39f9] UnboundLocalError: local variable
'vdi_ref' referenced before assignment
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