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If you have a qemu build that lacks the blockio tune monitor command, then this command: $ virsh blkdeviotune rhel6u2 hda --total_bytes_sec 1000 error: Unable to change block I/O throttle error: internal error Unexpected error fails as expected (well, the error message is lousy), but the next dumpxml shows that the domain was modified anyway. Worse, that means if you save the domain then restore it, the restore will likely fail due to throttling being unsupported, even though no throttling should even be active because the monitor command failed in the first place. * src/qemu/qemu_driver.c (qemuDomainSetBlockIoTune): Check for error before making modification permanent.
LibVirt : simple API for virtualization
Libvirt is a C toolkit to interact with the virtualization capabilities
of recent versions of Linux (and other OSes). It is free software
available under the GNU Lesser General Public License. Virtualization of
the Linux Operating System means the ability to run multiple instances of
Operating Systems concurrently on a single hardware system where the basic
resources are driven by a Linux instance. The library aim at providing
long term stable C API initially for the Xen paravirtualization but
should be able to integrate other virtualization mechanisms if needed.
Daniel Veillard <veillard@redhat.com>