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[Elancheran S <1881727@xxxxxxxxxxxxxxxxxx>]

Public bug reported:

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
https://github.com/openstack/nova/blob/stable/pike/nova/virt/libvirt/driver.py#L2007-L2008

** Affects: nova
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1881727

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

Status in OpenStack Compute (nova):
  New

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
  https://github.com/openstack/nova/blob/stable/pike/nova/virt/libvirt/driver.py#L2007-L2008

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