[Bug 1994521] Re: HPE3PAR: Failing to clone a volume having children

[Mauricio Faria de Oliveira]

Hey Seyeong, Dariusz,

Thanks for the clarifications!

Yes, this needs coordination with the Openstack Engineering team
not only for the other changes they plan to combine in an upload,
but also regarding the upstream acceptance situation for this in
the different branches.

Apparently, they still haven't confirmed that, so I have reached
out to James (as I'm involved in one of the three bugs) to offer
help and ask the question whether they are OK with these changes.

Thanks!

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https://bugs.launchpad.net/bugs/1994521

Title:
  HPE3PAR: Failing to clone a volume having children

Status in Cinder:
  Fix Released
Status in cinder package in Ubuntu:
  Fix Released
Status in cinder source package in Jammy:
  Incomplete
Status in cinder source package in Mantic:
  Fix Released
Status in cinder source package in Noble:
  Fix Released

Bug description:
  [Impact]

  The customer faced issue when they are using nova with 3par storage.
  they can't delete volume if there is children and it is attached to vm.

  it makes sense they can't delete it as the children has attachment but
  nova should expose proper error when trying deletion.

  [Test Case]
  Haven't tested this as there is no test 3par storage.
  Volume->Snapshot->Volume2
  Volume2 is attached to some VM.
  and can't delete Volume without proper error msg.

  [Where problems could occur]
  This is related to hpe3par storage.
  snapshot handling could be issue with this patch.
  deleting volume could be issue with this patch.

  [Others]

  Original Desc

  When we try to delete a snapshot, we flatten it's dependent volumes by copying them to a new volume and deleting the original one.
  We fail to copy the volume when it has children and it is not handled in the code.

  : hpe3parclient.exceptions.HTTPConflict: Conflict (HTTP 409) 32 -
  volume has a child

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