Cinder related change: https://review.openstack.org/#/c/331973/

** Changed in: os-brick
       Status: In Progress => Invalid

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https://bugs.launchpad.net/bugs/1592043

Title:
  os-brick 1.4.0 increases volume setup failure rates

Status in OpenStack Compute (nova):
  Fix Released
Status in os-brick:
  Invalid
Status in oslo.privsep:
  New

Bug description:
  Since merging upper constraints 1.4.0 into upper-constraints, the
  multinode grenade jobs are hitting a nearly 1/3 failure rate on boot
  from volume scenarios around volume setup. This would be on Newton
  code using Mitaka configs.

  Representative failures are of the following form:
  http://logs.openstack.org/71/327971/5/gate/gate-grenade-dsvm-neutron-
  
multinode/f2690e3/logs/new/screen-n-cpu.txt.gz?level=WARNING#_2016-06-13_15_22_59_095

  The 1/3 failure rate is suspicious, and in the past has often hinted
  towards a race condition interacting between parallel API requests.

  The failure rate increase can be seen here -
  http://tinyurl.com/zrq35e8

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