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[Sylvain Bauza <1921381@xxxxxxxxxxxxxxxxxx>]

** Also affects: nova
   Importance: Undecided
       Status: New

** Changed in: nova
       Status: New => Confirmed

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

** Changed in: nova
     Assignee: (unassigned) => Lee Yarwood (lyarwood)

** Tags added: wallaby-rc-potential

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https://bugs.launchpad.net/bugs/1921381

Title:
  iSCSI: Flushing issues when multipath config has changed

Status in OpenStack Compute (nova):
  Confirmed
Status in os-brick:
  In Progress
Status in os-brick wallaby series:
  New
Status in os-brick xena series:
  In Progress

Bug description:
  OS-Brick disconnect_volume code assumes that the use_multipath
  parameter that is used to instantiate the connector has the same value
  than the connector that was used on the original connect_volume call.

  Unfortunately this is not necessarily true, because Nova can attach a
  volume, then its multipath configuration can be enabled or disabled,
  and then a detach can be issued.

  This leads to a series of serious issues such as:

  - Not flushing the single path on disconnect_volume (possible data loss) and leaving it as a leftover device on the host when Nova calls terminate-connection on Cinder.
  - Not flushing the multipath device (possible data loss) and leaving it as a lefover device similarly to the other case.

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