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[OpenStack Infra <1612057@xxxxxxxxxxxxxxxxxx>]

Reviewed:  https://review.openstack.org/353862
Committed: https://git.openstack.org/cgit/openstack/nova/commit/?id=e1ddae83901735d9bffd9d736f3c033c8986041f
Submitter: Jenkins
Branch:    master

commit e1ddae83901735d9bffd9d736f3c033c8986041f
Author: John Hua <john.hua@xxxxxxxxxx>
Date:   Thu Aug 11 14:48:47 2016 +0800

    Use physical utilisation for cached images
    
    Since glance images are downloaded and snapshotted before they are used.
    Only a small proportion of its VDI will be in use and it will never grow.
    So the real disk usage for VDIs varies with their capability to expand.
    Disks connected to VMs continue to use the virtual utilisation as they
    are able to expand.
    
    Change-Id: Ie7aae58a47e6651af5b609fb9abc13ab5d61e4df
    Closes-bug: 1612057


** Changed in: nova
       Status: In Progress => Fix Released

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https://bugs.launchpad.net/bugs/1612057

Title:
  XenAPI: Wrong calculation of available disk

Status in OpenStack Compute (nova):
  Fix Released

Bug description:
  https://git.openstack.org/cgit/openstack/nova/tree/nova/virt/xenapi/host.py#n230
  will report the virtual utilisation of the SR; which is intentional as
  the assumption is that VMs may eventually use all of the space they
  are entitled to.

  However, this does not have to include glance images.
  For example:
  [root@maul ~]# xe vdi-list name-label="Glance Image 792e7f09-0c87-4f60-9861-b580fbc3c9cb" params=virtual-size,physical-utilisation
  virtual-size ( RO)            : 42949672960
      physical-utilisation ( RO): 88576

  Because the VHD has a virtual size of 40GB when uploaded to glance,
  the VDI has to be 40GB, but we know it can never increase because we
  will always take a snapshot of it.  This, this 88K of physical
  utilisation is interpreted as 40GB by our code.

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