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2016-07-05 02:35:44 -0500 answered a question Setting Qemu Architecture

Your flavor looks correct. It's just that you don't have any hypervisors (nova-compute nodes) that can run instances with the desired ppc architecture. Try configuring (some of) your compute nodes with cpu_mode set to custom and an appropriate cpu_model in the [libvirt]section of nova.conf. We do this here to emulate slightly different (restricted) models of Intel x86 CPUs compared to the actual hardware; I'm not sure whether this mechanism is general enough to select a different CPU architecture.

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2015-02-10 04:49:07 -0500 commented answer Why is juno ceph using "qemu-img convert" for instance snapshots?

The explanation sounds plausible, but this particular implementation looks less than ideal. In particular, the image seems to be converted to a local filesystem, which is bound to run into space issues. Couldn't qemu-img write it to RBD directly? Or, even better, shouldn't "rbd flatten" be used?

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