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

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

** Changed in: nova
    Milestone: None => kilo-1

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https://bugs.launchpad.net/bugs/1326238

Title:
  libvirt: use qdisk instead of blktap for Xen

Status in OpenStack Compute (Nova):
  Fix Released

Bug description:
  Using libvirt and Xen, nova is using "tap" (Xen 4.0) and "tap2" (Xen >
  4.0) for the disk driver.

  According to the Xen documentation and ML, the usage of qdisk is preferred
  against blktap2 [1].

  [1] http://lists.xen.org/archives/html/xen-devel/2013-08/msg02633.html

  Moreover, libxenlight (xl, libxl) is the replacement of xend (xm) from Xen >=
  4.2. According to the disk configuration documentation for xl [2], the device
  driver "(...) should not be specified, in which case libxl will automatically
   determine the most suitable backend."

  [2] http://xenbits.xen.org/docs/unstable/misc/xl-disk-
  configuration.txt

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