Public bug reported:

[Summary]
unexpected rbd import when creating instance

[Steps to reproduce]
1. glance use ceph as backend store. upload a new image which disk_format is 
raw, named test_image
2. set images_type to raw at nova.conf and restart the nova-compute service, on 
node mystack-compute-01
3. use test_image to create an instance on mystack-compute-01, now nova will 
download the test-image into _base directory as the base image file.
4. change images_type to rdb and restart nova-compute service, and use 
test_image create a new instance. nova will use 'rbd import' command to import 
the base image file in _base into ceph cluster rather than clone it.


I think the 'rbd import' is time-consuming. Since the test_image is stored in 
ceph and disk_format is raw, which means is_cloneable, nova can direct clone it 
rather than import.

** Affects: nova
     Importance: Undecided
     Assignee: hzliaoyuehua (hzliaoyuehua)
         Status: New

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

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https://bugs.launchpad.net/bugs/1753730

Title:
  unexpected rbd import when creating instance

Status in OpenStack Compute (nova):
  New

Bug description:
  [Summary]
  unexpected rbd import when creating instance

  [Steps to reproduce]
  1. glance use ceph as backend store. upload a new image which disk_format is 
raw, named test_image
  2. set images_type to raw at nova.conf and restart the nova-compute service, 
on node mystack-compute-01
  3. use test_image to create an instance on mystack-compute-01, now nova will 
download the test-image into _base directory as the base image file.
  4. change images_type to rdb and restart nova-compute service, and use 
test_image create a new instance. nova will use 'rbd import' command to import 
the base image file in _base into ceph cluster rather than clone it.

  
  I think the 'rbd import' is time-consuming. Since the test_image is stored in 
ceph and disk_format is raw, which means is_cloneable, nova can direct clone it 
rather than import.

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