Hi Michal, I am using qemu version 1.0 (qemu-kvm-1.0) i guess this is the problem, should i have to upgrade the qemu version inorder to get the things work?
Regards, Vikrant On Thu, May 9, 2013 at 5:54 PM, vikrant verma <[email protected]>wrote: > Hi Michal, > > Thanks for the reply. > > But i want to keep this setting, my intention is to set IO throttling (IO > tunning) over the block storage which is attached to the VM. > > As per my understanding there are 2 ways to do it. > > 1. Using Cgroup - we can put the IO throttling on the device using > cgroup command (this i have tried and it is working) > > 2. Using Libvirt API virDomainSetBlockIoTune() - But i am not able to > achieve the IO throttling using it, please suggest how to do it. > > Please let me know how to do it using Libvirt. > > Regards, > Vikrant > > > > > On Thu, May 9, 2013 at 5:42 PM, Michal Privoznik <[email protected]>wrote: > >> 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 >> > >
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