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Epic Name:
Provide image size to Glance when creating snapshots
Story Points:
5
Blocked:
False
Blocked Reason:

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None

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None
Ready:
False
Dev Approval:
Proposed
Docs Approval:
Proposed
Epic Status:
To Do
PM Approval:
Proposed
QE Approval:
Proposed
Status Summary:

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All required changes in glance, glance_store and python-glanceclient are merged upstream during this cycle (Flamingo). Now consumers like nova and cinder can utilize this feature and fix the behavior mention in this bug.

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All required changes in glance, glance_store and python-glanceclient are merged upstream during this cycle (Flamingo). Now consumers like nova and cinder can utilize this feature and fix the behavior mention in this bug.
Intelligence Requested:
Market:
PX Impact Score:

Speed up snapshots of image-backed VMs when the Glance storage backend is Cinder
Uploading an image to Glance without providing the image size triggers a slow process called "resize-before-write" which first creates a 1 GB Cinder volume then iteratively extends the volume 1 GB at a time until the image is all written
Glance recently added an API allowing specification of image size for upload

Acceptance Criteria:

Nova provides the image size to Glance API when uploading a snapshot and Glance creates a Cinder volume of the required size once

depends on

OSPRH-13823 Creating Instance snapshots from image boot instances fails with "resize-before-write" message when Glance backend is Cinder