Driver concept

Terminate connection

• Local connections require no action
• Remote connections need correct termination by target driver
• Failed instance live-migrations require clean up of created volume and clone target
• Successful instance live-migrations require enabling hydration on destination volume

sequenceDiagram
  box volume host
  participant a as cinder-volume
  end
  participant db as Database
  box source volume host
  participant b as cinder-volume
  end
  a->>+a: ...
driver.terminate_connection()
  alt only a single remote attachment
    a->>a: target_driver.terminate_connection()
  else volume is a clone target and hydration has not started
    note over a,b: live-migration scenario
    alt host in connector is volume host
      note over a,b: live-migration has failed
      a->>a: load linear target
      a->>a: delete metadata
      a->>b: connector.disconnect_volume()
(connection_info from attachment)
      a->>db: switch volume identities
      a->>a: delete_volume()
    else
      note over a,b: live-migration has succeded
      a->>-a: enable hydration
    end
  end

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