yahoo-eng-team team mailing list archive

[Nikita Gerasimov <nikita.gerasimov@xxxxxxxxxx>]

Public bug reported:

There are Xen servers which do not support http://wiki.xen.org/wiki/Blktap (e.g. Oracle VM Server for x86) but are still operational with  simple file driver. To support those xen servers as compute platform we have to change method pick_disk_driver_name() in nova/virt/libvirt/utils.py to return "file" in the case hypervisor is Xen and Blktap is not operational.
The side effect is: file driver does not support "qcow2" disk format. So we also have to force 'use_cow_images' config to False for those compute nodes.

** Affects: nova
     Importance: Undecided
         Status: New


** Tags: libvirt xen

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https://bugs.launchpad.net/bugs/1323722

Title:
  libvirt Xen have to use "file" disk driver in the case of compute node
  doesn't support blktap.

Status in OpenStack Compute (Nova):
  New

Bug description:
  There are Xen servers which do not support http://wiki.xen.org/wiki/Blktap (e.g. Oracle VM Server for x86) but are still operational with  simple file driver. To support those xen servers as compute platform we have to change method pick_disk_driver_name() in nova/virt/libvirt/utils.py to return "file" in the case hypervisor is Xen and Blktap is not operational.
  The side effect is: file driver does not support "qcow2" disk format. So we also have to force 'use_cow_images' config to False for those compute nodes.

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