[libvirt-users] Storage statistics
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