[Bug 1900775] Re: Cinder fails to create image-based volume if mirroring is enabled

[Corey Bryant]

** Also affects: cinder (Ubuntu Groovy)
   Importance: Undecided
       Status: New

** Also affects: cinder (Ubuntu Xenial)
   Importance: Undecided
       Status: New

** Also affects: cinder (Ubuntu Bionic)
   Importance: Undecided
       Status: New

** Also affects: cinder (Ubuntu Focal)
   Importance: Undecided
       Status: New

** Changed in: cinder (Ubuntu Groovy)
       Status: New => Triaged

** Changed in: cinder (Ubuntu Focal)
       Status: New => Triaged

** Changed in: cinder (Ubuntu Bionic)
       Status: New => Triaged

** Changed in: cinder (Ubuntu Xenial)
       Status: New => Triaged

** Changed in: cinder (Ubuntu Xenial)
   Importance: Undecided => High

** Changed in: cinder (Ubuntu Focal)
   Importance: Undecided => High

** Changed in: cinder (Ubuntu Groovy)
   Importance: Undecided => High

** Changed in: cinder (Ubuntu Bionic)
   Importance: Undecided => High

** Also affects: cloud-archive
   Importance: Undecided
       Status: New

** Also affects: cloud-archive/mitaka
   Importance: Undecided
       Status: New

** Also affects: cloud-archive/queens
   Importance: Undecided
       Status: New

** Also affects: cloud-archive/stein
   Importance: Undecided
       Status: New

** Also affects: cloud-archive/victoria
   Importance: Undecided
       Status: New

** Also affects: cloud-archive/train
   Importance: Undecided
       Status: New

** Also affects: cloud-archive/ussuri
   Importance: Undecided
       Status: New

** Changed in: cloud-archive/mitaka
   Importance: Undecided => High

** Changed in: cloud-archive/mitaka
       Status: New => Triaged

** Changed in: cloud-archive/queens
   Importance: Undecided => High

** Changed in: cloud-archive/queens
       Status: New => Triaged

** Changed in: cloud-archive/stein
   Importance: Undecided => High

** Changed in: cloud-archive/stein
       Status: New => Triaged

** Changed in: cloud-archive/train
   Importance: Undecided => High

** Changed in: cloud-archive/train
       Status: New => Triaged

** Changed in: cloud-archive/ussuri
   Importance: Undecided => High

** Changed in: cloud-archive/ussuri
       Status: New => Triaged

** Changed in: cloud-archive/victoria
   Importance: Undecided => High

** Changed in: cloud-archive/victoria
       Status: New => Triaged

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https://bugs.launchpad.net/bugs/1900775

Title:
  Cinder fails to create image-based volume if mirroring is enabled

Status in charm-ceph-rbd-mirror:
  Invalid
Status in Cinder:
  In Progress
Status in Ubuntu Cloud Archive:
  Triaged
Status in Ubuntu Cloud Archive mitaka series:
  Triaged
Status in Ubuntu Cloud Archive queens series:
  Triaged
Status in Ubuntu Cloud Archive stein series:
  Triaged
Status in Ubuntu Cloud Archive train series:
  Triaged
Status in Ubuntu Cloud Archive ussuri series:
  Triaged
Status in Ubuntu Cloud Archive victoria series:
  Triaged
Status in cinder package in Ubuntu:
  Triaged
Status in cinder source package in Xenial:
  Triaged
Status in cinder source package in Bionic:
  Triaged
Status in cinder source package in Focal:
  Triaged
Status in cinder source package in Groovy:
  Triaged

Bug description:
  OpenStack Train, Ceph Nautilus, ceph-rbd-mirror is deployed in dual-way.
  Cinder has Ceph as backend for volumes.

  Creating a volume from qcow2 image.
  Current flow is the following:
  1. Cinder creates empty volume in Ceph
  2. Cinder downloads the image
  3. Image is converted to raw
  4. Volume is deleted https://github.com/openstack/cinder/blob/master/cinder/volume/drivers/rbd.py#L1611
  5. Cinder performs "rbd import" using unpacked raw image as source.

  Apparently rbd-mirror daemon creates a snapshot upon the image creation in Ceph (seems for mirroring purposes) which for empty image lasts for about a second.
  It happens that step4 may be performed (very often) during the period of time when the snapshot exists, and it fails with "Cannot delete the volume with snapshots" error.
  The only way to fix this behaviour - disable mirroring of the backend pool which is not desired.

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