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["Markus Zoeller \(markus_z\)" <mzoeller@xxxxxxxxxx>]

@Tracy Jones: For your information. Please correct the project
assignment if I were wrong.

** Also affects: cinder
   Importance: Undecided
       Status: New

** Changed in: nova
       Status: New => Invalid

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https://bugs.launchpad.net/bugs/1521894

Title:
  Datastore selection in cinder vmdk driver is too slow

Status in Cinder:
  Incomplete
Status in OpenStack Compute (nova):
  Invalid

Bug description:
  Detail description and steps:
  1. Configure vmdk as the volume_driver in cinder.conf, restart cinder corresponding service. Just like below:
  volume_driver=cinder.volume.drivers.vmware.vmdk.VMwareVcVmdkDriver
  2. Create a volume with command with "cinder create..."

  Current problem:
  If there are many hosts in the environment, for example 200 hosts, and the top hosts of the hosts list don't meet the requirement, it will lead openstack to interactive many times with vcenter(api calls), and it will cause the performance of volume creation very bad. The time cost mainly focuses on datastore selection phase.

  
  Expected result:
  Even though there are many hosts in the environment, the duration for volume creation(datastore selection) with vmdk driver is within acceptable range.

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