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Type: Epic
Resolution: Unresolved
Priority: Major
Fix Version/s: rhos-18.0 Feature Release 2 (Mar 2025)
Affects Version/s: None
Component/s: openstack-cinder
Labels:
- FutureFeature
- Triaged

Epic Name:
[RFE] cinder backup needs to restore thin volumes (new volumes only)
Story Points:
8
Blocked:
False
Ready:
False
Parent Link:
OSPRH-5024Ceph RBD clone optimisations
Bugzilla Bug:
RHBZ: 1855709
Dev Approval:
Committed
Docs Approval:
No Docs Impact
Feature Link:
OSPRH-5024 - Ceph RBD clone optimisations
PM Approval:
Committed
QE Approval:
Committed
Hierarchy Progress Bar:

0% To Do, 33% In Progress, 67% Done
Release Note Text:

Hide
.Enhanced Block Storage volume restoration on thinly provisioned back ends

This enhancement optimizes the process of restoring Block Storage volume backups on any thinly provisioned back end. Previously, when restoring a backup on a thinly provisioned back end, the full volume size was restored instead of only restoring the portion of the volume that was used. This caused unnecessary network traffic and greatly increased the time taken by the restoration process. This enhancement ensures that when restoring a volume on a thinly provisioned back end, only the portion of the volume that was used is restored.

Show
.Enhanced Block Storage volume restoration on thinly provisioned back ends This enhancement optimizes the process of restoring Block Storage volume backups on any thinly provisioned back end. Previously, when restoring a backup on a thinly provisioned back end, the full volume size was restored instead of only restoring the portion of the volume that was used. This caused unnecessary network traffic and greatly increased the time taken by the restoration process. This enhancement ensures that when restoring a volume on a thinly provisioned back end, only the portion of the volume that was used is restored.
Release Note Type:
Enhancement
Release Note Status:
Done
Test Coverage:

Proposed
Test Plan:
https://polarion.engineering.redhat.com/polarion/#/project/RHOSO/wiki/Storage-Cinder/_RFE_%20cinder%20backup%20needs%20to%20restore%20thin%20volumes%20_new%20volumes%20only_
Errata Link:
https://errata.engineering.redhat.com/advisory/140154

Release Blocker:
Rejected

SFDC Cases Links:
SFDC Cases Counter:
SFDC Cases Open:

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:

is cloned by

OSPRH-8690 TechDebt - [RFE] cinder backup needs to restore thin volumes (new volumes only)