本文整理汇总了Python中nova.virt.xenapi.vm_utils.VMHelper.get_vdi_for_vm_safely方法的典型用法代码示例。如果您正苦于以下问题：Python VMHelper.get_vdi_for_vm_safely方法的具体用法？Python VMHelper.get_vdi_for_vm_safely怎么用？Python VMHelper.get_vdi_for_vm_safely使用的例子？那么恭喜您, 这里精选的方法代码示例或许可以为您提供帮助。您也可以进一步了解该方法所在类nova.virt.xenapi.vm_utils.VMHelper的用法示例。
在下文中一共展示了VMHelper.get_vdi_for_vm_safely方法的1个代码示例，这些例子默认根据受欢迎程度排序。您可以为喜欢或者感觉有用的代码点赞，您的评价将有助于系统推荐出更棒的Python代码示例。
示例1: migrate_disk_and_power_off
# 需要导入模块: from nova.virt.xenapi.vm_utils import VMHelper [as 别名]
# 或者: from nova.virt.xenapi.vm_utils.VMHelper import get_vdi_for_vm_safely [as 别名]
def migrate_disk_and_power_off(self, instance, dest):
"""Copies a VHD from one host machine to another.
:param instance: the instance that owns the VHD in question.
:param dest: the destination host machine.
:param disk_type: values are 'primary' or 'cow'.
"""
vm_ref = VMHelper.lookup(self._session, instance.name)
# The primary VDI becomes the COW after the snapshot, and we can
# identify it via the VBD. The base copy is the parent_uuid returned
# from the snapshot creation
base_copy_uuid = cow_uuid = None
template_vdi_uuids = template_vm_ref = None
try:
# transfer the base copy
template_vm_ref, template_vdi_uuids = self._get_snapshot(instance)
base_copy_uuid = template_vdi_uuids['image']
vdi_ref, vm_vdi_rec = \
VMHelper.get_vdi_for_vm_safely(self._session, vm_ref)
cow_uuid = vm_vdi_rec['uuid']
params = {'host': dest,
'vdi_uuid': base_copy_uuid,
'instance_id': instance.id,
'sr_path': VMHelper.get_sr_path(self._session)}
task = self._session.async_call_plugin('migration', 'transfer_vhd',
{'params': pickle.dumps(params)})
self._session.wait_for_task(task, instance.id)
# Now power down the instance and transfer the COW VHD
self._shutdown(instance, vm_ref, hard=False)
params = {'host': dest,
'vdi_uuid': cow_uuid,
'instance_id': instance.id,
'sr_path': VMHelper.get_sr_path(self._session), }
task = self._session.async_call_plugin('migration', 'transfer_vhd',
{'params': pickle.dumps(params)})
self._session.wait_for_task(task, instance.id)
finally:
if template_vm_ref:
self._destroy(instance, template_vm_ref,
shutdown=False, destroy_kernel_ramdisk=False)
# TODO(mdietz): we could also consider renaming these to something
# sensible so we don't need to blindly pass around dictionaries
return {'base_copy': base_copy_uuid, 'cow': cow_uuid}