Hi all, I'd like to get a few storage statistics from a running vm. I'd like to know read and write data about QCOW2 devices and about RBD volumes. I did try to execute a command similar to this: virsh qemu-monitor-command vm-vnc '{ "execute": "query-block"}' as described here: https://www.berrange.com/posts/2011/12/19/using-command-line-arg-monitor-... and implemented here: https://github.com/cernceph/ceph-scripts/blob/master/tools/virsh-throttle... But I do not get any live data. As example, I get this values about RBD volumes whether I do or I don't read data from the volume inside the vm: { "device": "drive-virtio-disk1", "inserted": { "backing_file_depth": 0, "bps": 0, "bps_rd": 0, "bps_wr": 0, "drv": "raw", "encrypted": false, "encryption_key_missing": false, "file": "rbd:volumes/volume-791f56d7-d115-4889-ba6c-85f7795b84db:id=cinder:key=AQCxLlxTYI2gHBAAWztETyuM1Nkgu6+0ANkl1w==:auth_supported=cephx\\;none:mon_host=10.19.24.127\\:6789\\;10.19.24.128\\:6789\\;10.19.24.129\\:6789", "image": { "cluster-size": 4194304, "dirty-flag": false, "filename": "rbd:volumes/volume-791f56d7-d115-4889-ba6c-85f7795b84db:id=cinder:key=AQCxLlxTYI2gHBAAWztETyuM1Nkgu6+0ANkl1w==:auth_supported=cephx\\;none:mon_host=10.19.24.127\\:6789\\;10.19.24.128\\:6789\\;10.19.24.129\\:6789", "format": "raw", "virtual-size": 5368709120 }, "iops": 0, "iops_rd": 50, "iops_rd_max": 5, "iops_wr": 50, "iops_wr_max": 5, "ro": false }, "io-status": "ok", "locked": false, "removable": false, "type": "unknown" } ] Do I need to enable the statistics collection in a specific way? Is there a better way of doing this? My system is an Ubuntu 14.04.2 with libvirtd (libvirt) 1.2.2, kernel 3.13.0-55, ceph version 0.80.9. Thanks Giuseppe -- Giuseppe Civitella gcivitella(a)entermail.it