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[Sergey Nikitin <snikitin@xxxxxxxxxxxx>]

Public bug reported:

On Horizon UI in Admin/Hypervisors, Disk Usage shows incorrect value.

Since using Ceph for ephemeral storage it adds up the ceph storage seen in each storage node rather than just using the real amount of ceph storage.
When we use Ceph we should divide sum of storage sizes by the replication factor of ceph storage. (Replication factor is a number  which tells how much times information into the Ceph storage would be duplicated).
For example we have 3 nodes and each node has 60 Gb storage.
Replication factor is 2. So total storage is 60 * 3 / 2 = 90.
But now size of a total storage is calculating as 60 + 60 + 60 = 180.  See the screenshot (the real size of storage is 207 Tb.)
So if type storage is Ceph, we should ask information about size of storage directly from Ceph.

** Affects: nova
     Importance: Undecided
     Assignee: Sergey Nikitin (snikitin)
         Status: New

** Attachment added: "hypervisor_summary.png"
   https://bugs.launchpad.net/bugs/1387812/+attachment/4249350/+files/hypervisor_summary.png

** Changed in: nova
     Assignee: (unassigned) => Sergey Nikitin (snikitin)

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https://bugs.launchpad.net/bugs/1387812

Title:
  Hypervisor summary shows incorrect total storage

Status in OpenStack Compute (Nova):
  New

Bug description:
  On Horizon UI in Admin/Hypervisors, Disk Usage shows incorrect value.

  Since using Ceph for ephemeral storage it adds up the ceph storage seen in each storage node rather than just using the real amount of ceph storage.
  When we use Ceph we should divide sum of storage sizes by the replication factor of ceph storage. (Replication factor is a number  which tells how much times information into the Ceph storage would be duplicated).
  For example we have 3 nodes and each node has 60 Gb storage.
  Replication factor is 2. So total storage is 60 * 3 / 2 = 90.
  But now size of a total storage is calculating as 60 + 60 + 60 = 180.  See the screenshot (the real size of storage is 207 Tb.)
  So if type storage is Ceph, we should ask information about size of storage directly from Ceph.

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