Hi,
While working on the CloudStack code for 4.2 I'm running into some
problems with QCOW2 and RBD format 2.
A quick cap of the problem:
CloudStack stores all the templates on "Secondary Storage" as QCOW2 files.
When a VM is deployed, this image will be copied (once) from Secondary
Storage to Primary Storage, this is done by qemu-img which does the
conversion.
When the image is on Primary Storage it will be copied to the
destination volume and the Instance/VM is started.
In that last step I want to use layering, but the problem is that my
image is RBD format 1 due to the qemu-img copy.
I can skip the qemu-img copy, but I have to find a way to go from QCOW2
to RBD format 2 in preferably one step. There is a issue about this in
the tracker [0], but that won't be finished on time.
Another idea would be to do QCOW2 -> RAW -> RBD format 2, but that extra
step will take a lot of time. It would also require some temporary
storage on the hypervisor.
I also thought of creating the RBD image prior to converting to it, but
that fails, since qemu-img won't let you convert to a already existing
image.
Any brights ideas? Maybe even doing the QCOW2 -> RAW format in memory?
In Java?
The goal is to go from QCOW2 to RBD format 2 in one step.
[0]: http://tracker.ceph.com/issues/4897
--
Wido den Hollander
42on B.V.
Phone: +31 (0)20 700 9902
Skype: contact42on
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