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[Matthew Booth <mbooth@xxxxxxxxxx>]

Public bug reported:

The libvirt driver creates flat disks as sparse by default. However, it
always returns over_committed_disk_size=0 for flat disks in
_get_instance_disk_info(). This incorrect data ends up being reported to
the scheduler in the libvirt driver's get_available_resource() via
_get_disk_over_committed_size_total().

_get_instance_disk_info() should use allocated blocks, not file size,
when calculating over_commited_disk_size for flat disks.

** Affects: nova
     Importance: Undecided
         Status: New


** Tags: libvirt low-hanging-fruit

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https://bugs.launchpad.net/bugs/1593155

Title:
  over_committed_disk_size is wrong for sparse flat files

Status in OpenStack Compute (nova):
  New

Bug description:
  The libvirt driver creates flat disks as sparse by default. However,
  it always returns over_committed_disk_size=0 for flat disks in
  _get_instance_disk_info(). This incorrect data ends up being reported
  to the scheduler in the libvirt driver's get_available_resource() via
  _get_disk_over_committed_size_total().

  _get_instance_disk_info() should use allocated blocks, not file size,
  when calculating over_commited_disk_size for flat disks.

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