Public bug reported:

Quota utilisation calculation connects to all cells DBs to get all consumed 
resources for a project.
When having several cells this can be inefficient and can fail if one of the 
cell DBs is not available.

To calculate the quota utilization of a project should be enough to use
only the cells where the project has/had instances. This information is
available in nova_api DB.

** Affects: nova
     Importance: Undecided
     Assignee: Surya Seetharaman (tssurya)
         Status: New


** Tags: cells quotas

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https://bugs.launchpad.net/bugs/1771810

Title:
  Quota calculation connects to all available cells

Status in OpenStack Compute (nova):
  New

Bug description:
  Quota utilisation calculation connects to all cells DBs to get all consumed 
resources for a project.
  When having several cells this can be inefficient and can fail if one of the 
cell DBs is not available.

  To calculate the quota utilization of a project should be enough to
  use only the cells where the project has/had instances. This
  information is available in nova_api DB.

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