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[Lee Yarwood <1906768@xxxxxxxxxxxxxxxxxx>]

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

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https://bugs.launchpad.net/bugs/1906768

Title:
  Evacuation results in multipath residue when use fc

Status in OpenStack Compute (nova):
  Won't Fix
Status in os-brick:
  Won't Fix

Bug description:
  My environment uses the OpenStack Pike，fibre Channel is used for back-end storage，when we place 'volume_use_multipath=True' in nova.conf, we found that evacuation leads to multipath residue。
    Trace code through Debug，we find os-brick can not find volume_paths, So the residual multipath cannot be removed。
     By analyzing the code，the Volume_path acquired through FC is not in a local directory, because it's on the new node.
  Repeat steps：
  1.configure cinder backend storage as fc san and multipath;
  2.boot vm from cinder volume;
  3.evacuate vm;
  4.execute commands at the old node to see the multipath,and you can see that vm multipath residue；

  If the multipath residue will cause an error during vm migration，eg:
  commandexecutionfailed: failed to execute command emultipath -l
  /dev/sdbx .

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