Re: [libvirt-users] Getting libvirt Error when setting IO tune read_bytes_sec value using libvirt API virDomainSetBlockIotune

On 09.05.2013 14:02, vikrant verma wrote: > Hi All, > > I am setting the value for "read_bytes_sec" using the following API code > > virDomainSetBlockIoTune(dom, "/mnt/tmpsdb/FileVM1", parainfoPtr, > nparams, 2); > > I am succesfully able to set this value and i can read it back using the API > > > virDomainGetBlockIoTune(dom,"/mnt/tmpsdb/FileVM1",parainfoPtr,&nparams,2); > > But after setting this value when i shutdown my VM and start it again I > am getting following error - > > ibvirtError: internal error Process exited while reading console log > output: qemu-system-x86_64: -drive > file=/mnt/tmpsdb/FileVM1,if=none,id=drive-ide0-1-1,format=raw,bps_rd=1048576: > Invalid parameter 'bps_rd' Interesting. What's the qemu version? bps_rs has been introduced in qemu-1.1 IIRC. > > > Note - when i see dumpxml of the VM following lines are got added after > setting the iotunes for read_bytes_sec > > <iotune> > <read_bytes_sec>1048576</read_bytes_sec> > </iotune> > Yep, that's correct. If you don't need this setting anymore, just delete it (e.g. by using virsh edit) and you should be able to start the domain up again. > > Please help me. Also i wanted to know whether we can set block IO tune > for a VM using the above API. Is it same as the IO throttling provided > by cgroup? > > > Michal