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RBD format 2 supports cloning (aka layering) where one base image can serve as a parent image for multiple child images. This enables fast deployment of a large amount of virtual machines, but it also saves spaces on the Ceph cluster and improves performance due to better caching. Qemu-img doesn't support RBD format 2 (yet), so to enable these functions the RADOS/RBD Java bindings are required. This patch also enables deployment of System VMs on RBD storage pools. Since we no longer require a patchdisk for passing the boot arguments we are able to deploy these VMs on RBD. |
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