Nova retains the 'delta' file for the entire snapshot upload time

Bug #1881727 reported by Elancheran S on 2020-06-02
This bug affects 1 person
Affects Status Importance Assigned to Milestone
OpenStack Compute (nova)
Elancheran S

Bug Description

When the live snapshot happens it setups a 100% copy of the original file using libvirt/qemu to sync the disk to it using "Shallow" mode (this is the .delta file). From that .delta file it extracts the image and uploads it. The delta file remains till the upload completes which results in 3x space required for each snapshots.

To fix this issue, the .delta file can be removed once the image is extracted from the .delta file

Elancheran S (tsecheran) wrote :

When concurrent snapshots happening in a multiple VM's on a hypervisor leads disk space running out due to the 3x space required.

By providing this fix i.e. deleting the '.delta' file would reduce the space requirement for the concurrent snapshots of multiple VMs in a single hypervisor.

Fix proposed to branch: master

Changed in nova:
assignee: nobody → Elancheran S (tsecheran)
status: New → In Progress
Changed in nova:
assignee: Elancheran S (tsecheran) → Lee Yarwood (lyarwood)
Changed in nova:
assignee: Lee Yarwood (lyarwood) → Elancheran S (tsecheran)
To post a comment you must log in.
This report contains Public information  Edit
Everyone can see this information.

Other bug subscribers