Bug 1855709

Summary:	[RFE] cinder backup needs to restore thin volumes (new volumes only)
Product:	Red Hat OpenStack	Reporter:	ggrimaux
Component:	openstack-cinder	Assignee:	Pete Zaitcev <zaitcev>
Status:	CLOSED MIGRATED	QA Contact:	Evelina Shames <eshames>
Severity:	medium	Docs Contact:	RHOS Documentation Team <rhos-docs>
Priority:	medium
Version:	13.0 (Queens)	CC:	eharney, gcharot, gfidente, pratik.bandarkar, zaitcev
Target Milestone:	Alpha	Keywords:	FutureFeature, Triaged
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Last Closed:	2023-11-24 18:27:04 UTC	Type:	Bug
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oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
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Embargoed:

Description ggrimaux 2020-07-10 09:38:39 UTC

Description of problem:
The current default behavior during a cinder-backup/cinder-restore procedure is that thin volumes are restored as thick. Taking much more space than necessary and creating problems during migration.

It would be good if the original volume size is kept during backup/restore procedure.

Version-Release number of selected component (if applicable):
rhosp13/openstack-cinder-api:124

How reproducible:
100%

Steps to Reproduce:
1.Create empty volume (10GB size but 0B used)
2.Cinder-backup to export the volume
3.Cinder-restore to import the volume
4.Volume now  uses 10GB of disk space

Actual results:
Thin volume become thick

Expected results:
Thin volume stay thin

Additional info:

Comment 1 Gregory Charot 2022-01-03 16:40:09 UTC

This RFE will be reviewed during the Z PTG and planned accordingly if higher OSP18 priorities are progressing as expected.

Comment 2 Gregory Charot 2022-04-21 16:48:31 UTC

This feature was reviewed during the PTG. For now we are only going to implement restoring thin backups to new volumes. Restoring to existing volumes (like the original one) requires more investigation and the implementation is much more complex.

This RFE now only covers restoring backup as thin for new volumes.