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[Thierry Carrez <thierry.carrez+lp@xxxxxxxxx>]

** Changed in: nova
       Status: Fix Committed => Fix Released

** Changed in: nova
    Milestone: None => grizzly-rc1

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https://bugs.launchpad.net/bugs/1086386

Title:
  Can no longer explicitly configure the libvirt cache mode for disk
  devices

Status in OpenStack Compute (Nova):
  Fix Released

Bug description:
  Can no longer explicitly configure the libvirt cache mode for disk
  devices

  In past versions of Nova it was possible to explicitly configure the
  cache mode of disks via the libvirt XML template. The new approach
  makes this a derived setting of either “none” or “writethrough” based
  on the support of O_DIRECT. Whilst this provides a good set of default
  settings it removes the ability of the cloud provider to use other
  modes such as “writeback” and “unsafe” which are valuable in certain
  configurations.

  The proposed change would allow the cache mode to be directly
  specified via configuration settings so as to override the default
  behaviour.

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