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[Bob Ball <1259163@xxxxxxxxxxxxxxxxxx>]

Public bug reported:

There is a race condition between dd and VBD.unplug in the nova compute
VM where we are using non-direct IO meaning the device might not be
synced before we attempt to unplug.

[17765.143078] blkfront device/vbd/51744 num-ring-pages 1 nr_ents 32.
[17765.380219] blkfront: xvdc: barrier: enabled
[17765.384874]  xvdc: unknown partition table
[17765.790561] vbd vbd-51744: 16 Device in use; refusing to close
[17765.828628] block xvdc: releasing disk

** Affects: nova
     Importance: Medium
     Assignee: Bob Ball (bob-ball)
         Status: In Progress


** Tags: xenserver

** Changed in: nova
   Importance: Undecided => Medium

** Changed in: nova
     Assignee: (unassigned) => Bob Ball (bob-ball)

** Tags added: xenserver

** Changed in: nova
    Milestone: None => icehouse-2

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https://bugs.launchpad.net/bugs/1259163

Title:
  XenAPI: dd into config drive must use direct IO

Status in OpenStack Compute (Nova):
  In Progress

Bug description:
  There is a race condition between dd and VBD.unplug in the nova
  compute VM where we are using non-direct IO meaning the device might
  not be synced before we attempt to unplug.

  [17765.143078] blkfront device/vbd/51744 num-ring-pages 1 nr_ents 32.
  [17765.380219] blkfront: xvdc: barrier: enabled
  [17765.384874]  xvdc: unknown partition table
  [17765.790561] vbd vbd-51744: 16 Device in use; refusing to close
  [17765.828628] block xvdc: releasing disk

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