We had the following exchange on the Fedora Cloud list, but I think it
now more properly belongs here;
On 03/12/2015 12:37 PM, Daniel P. Berrange wrote:
On Thu, Mar 12, 2015 at 12:17:06PM -0400, Adam Young wrote:
So, it looks like xz is not supported by OpenStack.
"So what" you say "OpenStack should use QCOW anyway."
Not with Ceph. Ceph does its own COW semantics with raw, and the qcow.
formats are not supported. (Yes that is a regular expression dot there)
The backends used in libvirt are supposed to be agnositic to the format
of the image uploaded to glance. ie if the image in glance is stored
in qcow2, but the backend is ceph, then Nova ought to be converting the
qcow2 image to raw format on the fly, because the user shouldn't be
exposed to details of the storage backend's capability. So if ceph
has trouble if people upload qcow, then that's a bug in openstack that
needs fixing.
I know Flavio Percoco has a working conversion mechanism now in Glance.
http://git.openstack.org/cgit/openstack/glance/commit/?id=1b144f4c12fd6da58d7c48348bf7bab5873388e9
Adding support for uploading xz compressed raw images sounds like a
pretty good idea too, as it'd reduce the upload time. Glance could
transparantly decompress it, or leave decompression to Nova.
Are there any library issues that make xz not a practical-to-support format?
And, this is a pretty big use case. IS there some way we can convert the
compression to a format supported by OpenStack, either .zip or .tar.gz
(yes, tar for some reason) or produce that as well as the xz format?
Regards,
Daniel
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