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[Bug 1162382] Re: LVM over ISCSI as default SR not working

To: yahoo-eng-team@xxxxxxxxxxxxxxxxxxx
From: John Garbutt <john@xxxxxxxxxxxxxxx>
Date: Wed, 08 May 2013 09:04:33 -0000
Reply-to: Bug 1162382 <1162382@xxxxxxxxxxxxxxxxxx>
Sender: bounces@xxxxxxxxxxxxx
Currently only VHD based SRs are supported. It would work if you use
NFS.

Unfortunately, LVHD is also not supported with Cinder right now either.
It doesn't really fit the model Cinder has. However, if your array is
supported over raw iSCSI with Cinder, it should work with XCP.

The LVHD SR does not work with VHD files, so does not work as the root
SR. Given how things work right now, you might find the RAW image will
work, but more by accident than by planning. It is quite hard to change
this right now, but patches welcome, and I may be able to help.

This is already covered in the docs. Do raise a doc bug if it seems
unclear.

** Tags added: xenserver

** Changed in: nova
       Status: New => Won't Fix

** Changed in: nova
   Importance: Undecided => Low

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https://bugs.launchpad.net/bugs/1162382

Title:
  LVM over ISCSI as default SR not working

Status in OpenStack Compute (Nova):
  Won't Fix

Bug description:
  Hi

  I have XCP pool with shared storage working on LVM over ISCSI. When I
  try to create a VM I get the following (version 2013.1):

  2013-03-30 22:49:02.711 ERROR nova.compute.manager [req-34dfe80c-76ab-40e9-81ba-4d20af45ea33 admin admin] [instance: 4436ad73-8d86-4982-97db-49f921beac55] Instance failed to spawn
  2013-03-30 22:49:02.711 TRACE nova.compute.manager [instance: 4436ad73-8d86-4982-97db-49f921beac55] Traceback (most recent call last):
  2013-03-30 22:49:02.711 TRACE nova.compute.manager [instance: 4436ad73-8d86-4982-97db-49f921beac55]   File "/opt/stack/nova/nova/compute/manager.py", line 1055, in _spawn
  2013-03-30 22:49:02.711 TRACE nova.compute.manager [instance: 4436ad73-8d86-4982-97db-49f921beac55]     block_device_info)
  2013-03-30 22:49:02.711 TRACE nova.compute.manager [instance: 4436ad73-8d86-4982-97db-49f921beac55]   File "/opt/stack/nova/nova/virt/xenapi/driver.py", line 171, in spawn
  2013-03-30 22:49:02.711 TRACE nova.compute.manager [instance: 4436ad73-8d86-4982-97db-49f921beac55]     admin_password, network_info, block_device_info)
  2013-03-30 22:49:02.711 TRACE nova.compute.manager [instance: 4436ad73-8d86-4982-97db-49f921beac55]   File "/opt/stack/nova/nova/virt/xenapi/vmops.py", line 468, in spawn
  2013-03-30 22:49:02.711 TRACE nova.compute.manager [instance: 4436ad73-8d86-4982-97db-49f921beac55]     undo_mgr.rollback_and_reraise(msg=msg, instance=instance)
  2013-03-30 22:49:02.711 TRACE nova.compute.manager [instance: 4436ad73-8d86-4982-97db-49f921beac55]   File "/opt/stack/nova/nova/utils.py", line 1250, in rollback_and_reraise
  2013-03-30 22:49:02.711 TRACE nova.compute.manager [instance: 4436ad73-8d86-4982-97db-49f921beac55]     self._rollback()
  2013-03-30 22:49:02.711 TRACE nova.compute.manager [instance: 4436ad73-8d86-4982-97db-49f921beac55]   File "/usr/lib/python2.7/contextlib.py", line 24, in __exit__
  2013-03-30 22:49:02.711 TRACE nova.compute.manager [instance: 4436ad73-8d86-4982-97db-49f921beac55]     self.gen.next()
  2013-03-30 22:49:02.711 TRACE nova.compute.manager [instance: 4436ad73-8d86-4982-97db-49f921beac55]   File "/opt/stack/nova/nova/virt/xenapi/vmops.py", line 451, in spawn
  2013-03-30 22:49:02.711 TRACE nova.compute.manager [instance: 4436ad73-8d86-4982-97db-49f921beac55]     vdis = create_disks_step(undo_mgr, disk_image_type, image_meta)
  2013-03-30 22:49:02.711 TRACE nova.compute.manager [instance: 4436ad73-8d86-4982-97db-49f921beac55]   File "/opt/stack/nova/nova/virt/xenapi/vmops.py", line 142, in inner
  2013-03-30 22:49:02.711 TRACE nova.compute.manager [instance: 4436ad73-8d86-4982-97db-49f921beac55]     rv = f(*args, **kwargs)
  2013-03-30 22:49:02.711 TRACE nova.compute.manager [instance: 4436ad73-8d86-4982-97db-49f921beac55]   File "/opt/stack/nova/nova/virt/xenapi/vmops.py", line 334, in create_disks_step
  2013-03-30 22:49:02.711 TRACE nova.compute.manager [instance: 4436ad73-8d86-4982-97db-49f921beac55]     block_device_info=block_device_info)
  2013-03-30 22:49:02.711 TRACE nova.compute.manager [instance: 4436ad73-8d86-4982-97db-49f921beac55]   File "/opt/stack/nova/nova/virt/xenapi/vmops.py", line 305, in _create_disks
  2013-03-30 22:49:02.711 TRACE nova.compute.manager [instance: 4436ad73-8d86-4982-97db-49f921beac55]     block_device_info=block_device_info)
  2013-03-30 22:49:02.711 TRACE nova.compute.manager [instance: 4436ad73-8d86-4982-97db-49f921beac55]   File "/opt/stack/nova/nova/virt/xenapi/vm_utils.py", line 518, in get_vdis_for_instance
  2013-03-30 22:49:02.711 TRACE nova.compute.manager [instance: 4436ad73-8d86-4982-97db-49f921beac55]     context, session, instance, name_label, image, image_type)
  2013-03-30 22:49:02.711 TRACE nova.compute.manager [instance: 4436ad73-8d86-4982-97db-49f921beac55]   File "/opt/stack/nova/nova/virt/xenapi/vm_utils.py", line 974, in _create_image
  2013-03-30 22:49:02.711 TRACE nova.compute.manager [instance: 4436ad73-8d86-4982-97db-49f921beac55]     image_id, image_type)
  2013-03-30 22:49:02.711 TRACE nova.compute.manager [instance: 4436ad73-8d86-4982-97db-49f921beac55]   File "/opt/stack/nova/nova/virt/xenapi/vm_utils.py", line 931, in _create_cached_image
  2013-03-30 22:49:02.711 TRACE nova.compute.manager [instance: 4436ad73-8d86-4982-97db-49f921beac55]     new_vdi_ref = _safe_copy_vdi(session, sr_ref, instance, root_vdi_ref)
  2013-03-30 22:49:02.711 TRACE nova.compute.manager [instance: 4436ad73-8d86-4982-97db-49f921beac55]   File "/opt/stack/nova/nova/virt/xenapi/vm_utils.py", line 566, in _safe_copy_vdi
  2013-03-30 22:49:02.711 TRACE nova.compute.manager [instance: 4436ad73-8d86-4982-97db-49f921beac55]     vdi_uuids=vdi_uuids, uuid_stack=_make_uuid_stack())
  2013-03-30 22:49:02.711 TRACE nova.compute.manager [instance: 4436ad73-8d86-4982-97db-49f921beac55]   File "/opt/stack/nova/nova/virt/xenapi/driver.py", line 733, in call_plugin_serialized
  2013-03-30 22:49:02.711 TRACE nova.compute.manager [instance: 4436ad73-8d86-4982-97db-49f921beac55]     rv = self.call_plugin(plugin, fn, params)
  2013-03-30 22:49:02.711 TRACE nova.compute.manager [instance: 4436ad73-8d86-4982-97db-49f921beac55]   File "/opt/stack/nova/nova/virt/xenapi/driver.py", line 729, in call_plugin
  2013-03-30 22:49:02.711 TRACE nova.compute.manager [instance: 4436ad73-8d86-4982-97db-49f921beac55]     host, plugin, fn, args)
  2013-03-30 22:49:02.711 TRACE nova.compute.manager [instance: 4436ad73-8d86-4982-97db-49f921beac55]   File "/opt/stack/nova/nova/virt/xenapi/driver.py", line 743, in _unwrap_plugin_exceptions
  2013-03-30 22:49:02.711 TRACE nova.compute.manager [instance: 4436ad73-8d86-4982-97db-49f921beac55]     return func(*args, **kwargs)
  2013-03-30 22:49:02.711 TRACE nova.compute.manager [instance: 4436ad73-8d86-4982-97db-49f921beac55]   File "/usr/local/lib/python2.7/dist-packages/XenAPI.py", line 229, in __call__
  2013-03-30 22:49:02.711 TRACE nova.compute.manager [instance: 4436ad73-8d86-4982-97db-49f921beac55]     return self.__send(self.__name, args)
  2013-03-30 22:49:02.711 TRACE nova.compute.manager [instance: 4436ad73-8d86-4982-97db-49f921beac55]   File "/usr/local/lib/python2.7/dist-packages/XenAPI.py", line 133, in xenapi_request
  2013-03-30 22:49:02.711 TRACE nova.compute.manager [instance: 4436ad73-8d86-4982-97db-49f921beac55]     result = _parse_result(getattr(self, methodname)(*full_params))
  2013-03-30 22:49:02.711 TRACE nova.compute.manager [instance: 4436ad73-8d86-4982-97db-49f921beac55]   File "/usr/local/lib/python2.7/dist-packages/XenAPI.py", line 203, in _parse_result
  2013-03-30 22:49:02.711 TRACE nova.compute.manager [instance: 4436ad73-8d86-4982-97db-49f921beac55]     raise Failure(result['ErrorDescription'])
  2013-03-30 22:49:02.711 TRACE nova.compute.manager [instance: 4436ad73-8d86-4982-97db-49f921beac55] Failure: ['XENAPI_PLUGIN_FAILURE', 'safe_copy_vdis', 'OSError', "[Errno 2] No such file or directory: '/var/run/sr-mount/4bf0449e-4a06-9324-0688-08c553b3ab57/tmpm9WMto'"]

  I'm new to openstack, but seems like nova tries to use it as ext local
  storage. Is this a bug or this type of storage is not supported?

  Thanks

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