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[Sean Dague <sean@xxxxxxxxx>]

This optimization has been awaiting someone to add unit tests for 4
months. Calling it Opinion not In Progress.

** Changed in: nova
       Status: In Progress => Confirmed

** Changed in: nova
       Status: Confirmed => Opinion

** Changed in: nova
     Assignee: wingwj (wingwj) => (unassigned)

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https://bugs.launchpad.net/bugs/1334923

Title:
  No need to backup instance when 'rotation' equals to 0

Status in OpenStack Compute (Nova):
  Opinion

Bug description:
  Nova will delete all backup images according the 'backup_type'
  parameter when 'rotation' equals to 0.

  But according the logic now, Nova will generate one new backup, and
  then delete it..

  So It's weird to snapshot a useless backup firstly IMO.
  We need to add one new branch here: if 'rotation' is equal to 0, no need to backup, just rotate it.

  The related discussion can be found here:
  http://lists.openstack.org/pipermail/openstack-dev/2014-June/038760.html

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