Re: [libvirt-users] data monitored by "virDomainBlockStats" API not consistent with ones reading from /proc/[pid]/io, and corrugated with /proc/diskstats

On 06/24/2014 02:24 AM, coperd wrote:

It is supposed that the VM’s disk “rd_bytes" and “wr_bytes" should

never exceed the value of the physical disk respectively, right ? That's a question for the qemu folks.

Doesn’t libvirt virDomainBlockStats read disk information from “proc” ?

No, libvirt reads it from the qemu QMP command query-blockstats. Beyond that, you'll have to investigate how qemu comes up with that number. -- Eric Blake eblake redhat com +1-919-301-3266 Libvirt virtualization library http://libvirt.org