yahoo-eng-team team mailing list archive

[Matthew Booth <mbooth@xxxxxxxxxx>]

Public bug reported:

During live migration we update bdm.connection_info for attached volumes
in pre_live_migration to reflect the new connection on the destination
node. This means that after migration completes we no longer have a
reference to the original connection_info to do the detach on the source
host, so we have to re-fetch it with a second call to
initialize_connection before calling disconnect.

Unfortunately the cinder driver interface does not strictly require that
multiple calls to initialize_connection will return consistent results.
Although they normally do in practice, there is at least one cinder
driver (delliscsi) which doesn't. This results in a failure to
disconnect on the source host post migration.

** Affects: nova
     Importance: Undecided
     Assignee: Matthew Booth (mbooth-9)
         Status: In Progress

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https://bugs.launchpad.net/bugs/1754716

Title:
  Disconnect volume on live migration source fails if
  initialize_connection doesn't return identical output

Status in OpenStack Compute (nova):
  In Progress

Bug description:
  During live migration we update bdm.connection_info for attached
  volumes in pre_live_migration to reflect the new connection on the
  destination node. This means that after migration completes we no
  longer have a reference to the original connection_info to do the
  detach on the source host, so we have to re-fetch it with a second
  call to initialize_connection before calling disconnect.

  Unfortunately the cinder driver interface does not strictly require
  that multiple calls to initialize_connection will return consistent
  results. Although they normally do in practice, there is at least one
  cinder driver (delliscsi) which doesn't. This results in a failure to
  disconnect on the source host post migration.

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