Hi Farnum, I follow the instructions on wiki to create a qemu image using qemu rbd, but failed. According to wiki, after compiled qemu and input the following command: $ qemu-img create -f rbd rbd:data/foo 10G But system tell me that "unknown format 'rbd'". which step did I miss? how to register a 'rbd' format? BTW, I run these commands on ceph cluster. Thanks a lot! -- best regards, Kevin Chen (éå) -- To unsubscribe from this list: send the line "unsubscribe ceph-devel" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html