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["ChangBo Guo\(gcb\)" <glongwave@xxxxxxxxx>]

Public bug reported:

While using ceph as backend , each compute node reports its disk usage
with  total backend pool disk usage,  this makes sense to caculate
incoming resource request like  booting a new instance or migrating
instance to this compute node.

SEE
https://github.com/openstack/nova/blob/master/nova/virt/libvirt/driver.py#L4334

but while get  hypervisor-stats,  we sum all the compute nodes's disk usage, that doesn't make sense for ceph backend.
That will show that disk usage  =  {actual disk usage} *  {number of compuet node}

https://github.com/openstack/nova/blob/master/nova/db/sqlalchemy/api.py#L648


what will handle this case ?

 take average value of   disk usage of each compute node instead while
using ceph ?

** Affects: nova
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1414432

Title:
  nova hypervisor-stats shows wrong  disk usage with ceph backend

Status in OpenStack Compute (Nova):
  New

Bug description:
  While using ceph as backend , each compute node reports its disk usage
  with  total backend pool disk usage,  this makes sense to caculate
  incoming resource request like  booting a new instance or migrating
  instance to this compute node.

  SEE
  https://github.com/openstack/nova/blob/master/nova/virt/libvirt/driver.py#L4334

  but while get  hypervisor-stats,  we sum all the compute nodes's disk usage, that doesn't make sense for ceph backend.
  That will show that disk usage  =  {actual disk usage} *  {number of compuet node}

  https://github.com/openstack/nova/blob/master/nova/db/sqlalchemy/api.py#L648

  
  what will handle this case ?

   take average value of   disk usage of each compute node instead while
  using ceph ?

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