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[Alvaro Lopez <1326238@xxxxxxxxxxxxxxxxxx>]

Public bug reported:

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

** Affects: nova
     Importance: Undecided
     Assignee: Alvaro Lopez (aloga)
         Status: In Progress


** Tags: libvirt xen

** Changed in: nova
       Status: New => In Progress

** Changed in: nova
     Assignee: (unassigned) => Alvaro Lopez (aloga)

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

Title:
  libvirt: use qdisk instead of blktap for Xen

Status in OpenStack Compute (Nova):
  In Progress

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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