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       """Creates a block device for an instance.
       Args:
        bdev: a ganeti.objects.Disk object
        size: the size of the physical underlying devices
        do_open: if the device should be `Assemble()`-d and
                 `Open()`-ed after creation
        disk: a ganeti.objects.Disk object
        size: the size of the physical underlying device
        owner: a string with the name of the instance
        on_primary: a boolean indicating if it will be created on the primary
          node or not
        info: string
       Returns:
         the new unique_id of the device (this can sometime be
-...
     class DevCacheManager(object):
       """Simple class for managing a chache of block device information.
       """Simple class for managing a cache of block device information.
       """
       _DEV_PREFIX = "/dev/"

         self._lv_name = new_name
         self.dev_path = "/dev/%s/%s" % (self._vg_name, self._lv_name)
       def Attach(self):
         """Attach to an existing LV.
         This method will try to see if an existing and active LV exists
         which matches the our name. If so, its major/minor will be
         which matches our name. If so, its major/minor will be
         recorded.
         """

           # ok, we created the new LVs, so now we know we have the needed
           # storage; as such, we proceed on the target node to rename
           # old_lv to _old, and new_lv to old_lv; note that we rename LVs
           # using the assumption than logical_id == physical_id (which in
           # using the assumption that logical_id == physical_id (which in
           # turn is the unique_id on that node)
           # FIXME(iustin): use a better name for the replaced LVs

         """Execute an opcode.
         Args:
          - cfg: the configuration in which we execute this opcode
          - opcode: the opcode to be executed
           op: the opcode to be executed
         """
         if not isinstance(op, opcodes.OpCode):

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