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[Launchpad Bug Tracker <1917721@xxxxxxxxxxxxxxxxxx>]

[Expired for OpenStack Compute (nova) because there has been no activity
for 60 days.]

** Changed in: nova
       Status: Incomplete => Expired

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https://bugs.launchpad.net/bugs/1917721

Title:
  nova volume attach scsi controller unit allocation  bug

Status in OpenStack Compute (nova):
  Expired

Bug description:
  The scsi controller unit number only increases without decreasing, and
  there is no recycling.

  virt/libvirt/driver.py
  ```
      def _get_scsi_controller_next_unit(self, guest):
          """Returns the max disk unit used by scsi controller"""
          xml = guest.get_xml_desc()
          tree = etree.fromstring(xml)
          addrs = "./devices/disk[target/@bus='scsi']/address[@type='drive']"

          ret = []
          for obj in tree.xpath(addrs):
              ret.append(int(obj.get('unit', 0)))
          return max(ret) + 1 if ret else 0
  ```

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