Bug 1041355

Summary: [RFE][nova]: Use a linked-clone image as snapshot image to improve original snapshot
Product: Red Hat OpenStack Reporter: RHOS Integration <rhos-integ>
Component: RFEsAssignee: RHOS Maint <rhos-maint>
Status: CLOSED UPSTREAM QA Contact:
Severity: unspecified Docs Contact:
Priority: unspecified    
Version: unspecifiedCC: markmc, yeylon
Target Milestone: ---Keywords: FutureFeature
Target Release: ---   
Hardware: Unspecified   
OS: Unspecified   
URL: https://blueprints.launchpad.net/nova/+spec/linked-snapshot
Whiteboard: upstream_milestone_none upstream_status_unknown upstream_definition_drafting
Fixed In Version: Doc Type: Enhancement
Doc Text:
Story Points: ---
Clone Of: Environment:
Last Closed: 2015-03-19 16:54:55 UTC Type: ---
Regression: --- Mount Type: ---
Documentation: --- CRM:
Verified Versions: Category: ---
oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: --- Target Upstream Version:

Description RHOS Integration 2013-12-12 15:35:14 UTC 
Cloned from launchpad blueprint https://blueprints.launchpad.net/nova/+spec/linked-snapshot.

Description:

The time needed from triggering snapshotting to the snapshot image available is highly depending on the size of the image generated by snapshotting. The current snapshot to clone an instance is taking too much time especially when the image size is huge (base + instance disk). To clone an instance faster, we can copy qcow2 image (instance disk) and upload it into glance as a fast-snapshot image. Each time the user launch new instances from fast-snapshot image, first check if it exists in _base folder, if not get it from glance, second check its backing file image exists in _base folder, if not get it from glance and last directly copy the fast-snapshot image to the instance folder as “disk” file. This feature can be combined with live-snapshot feature (https://blueprints.launchpad.net/nova/+spec/live-snapshot-vms)to provide fast VM clone and restoring/rollback.

Specification URL (additional information):

None