Comment 32 for bug 1578036

I have some time recently, let me see.

------------------ Original ------------------
From: "weiguo sun"<email address hidden>;
Date: Tue, Oct 17, 2017 08:12 AM
To: "xiaojun.liao"<email address hidden>;

Subject: [Bug 1578036] Re: ceph incremental backup fails in mitaka

I am still seeing the error with the above commit
(https://review.openstack.org/511232)for "in-use" volume with ceph
volume & backup backend. The 2nd issue pointed out by Gaudenz in post#16
doesn't seem be resolved where ceph driver is trying to perform the
differential export with a snapshot created against the original ceph
volume instead of the snap-clone of the original ceph volume returned by
"get_backup_device" in "cinder/backup/manager.py".

When "rbd export-diff --id xxx --conf /tmp/tmpN0XVXO --pool xxx cinder-
pool-01/volume-origina-
<email address hidden> -"
is attemped, it will fail with "Numerical argument out of domain" since
the snapshot
(backup.737df596-3922-4f60-8028-81e22a22a57f.snap.1507841205.47)
generated by "source_rbd_image.create_snap(new_snap)" is against the
snap-clone instead.

I am testing this against our Newton tree but I don't see any code in
the latest master branch addressing this mix-up issue.

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https://bugs.launchpad.net/bugs/1578036

Title:
  ceph incremental backup fails in mitaka

Status in Cinder:
  New
Status in os-brick:
  Fix Committed

Bug description:
  When I try to backup volume (Ceph backend) via "cinder backup" to 2nd
  Ceph cluster cinder create a full backup each time instead diff
  backup.

  mitaka release

  cinder-backup 2:8.0.0-0ubuntu1 all Cinder storage service - Scheduler server
  cinder-common 2:8.0.0-0ubuntu1 all Cinder storage service - common files
  cinder-volume 2:8.0.0-0ubuntu1 all Cinder storage service - Volume server
  python-cinder 2:8.0.0-0ubuntu1 all Cinder Python libraries

  My steps are:
  1. cinder backup-create a3bacaf5-6cf8-480d-a5db-5ecdf4223b6a
  2. cinder backup-create --incremental --force a3bacaf5-6cf8-480d-a5db-5ecdf4223b6a

  and what I have in Ceph backup cluster:
  rbd --cluster bak -p backups du
  volume-a3bacaf5-6cf8-480d-a5db-5ecdf4223b6a.backup.37cddcbf-4a18-4f44-927d-5e925b37755f 1024M 1024M
  volume-a3bacaf5-6cf8-480d-a5db-5ecdf4223b6a.backup.55e5c1a3-8c0c-4912-b98a-1ea7e6396f85 1024M 1024M

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