[one-users] virtio-blk-data-plane and x-data-plane=on

[Erico Augusto Cavalcanti Guedes]

Hello,

on [1], page 10, section 2.3 - KVM Configuration: "To achieve the best
possible I/O rates for the KVM guest, the virtio-blk-data-plane feature was
enabled for each LUN (a disk or partition) that was passed from the host to
the guest. To enable virtio-blk-data-plane for a LUN being passed to the
guest, the x-data-plane=on option was added for that LUN in the qemu-kvm
command line used to set up the guest. For example:
/usr/libexec/qemu-kvm -drive
if=none,id=drive0,cache=none,aio=native,format=raw,file=<disk or partition>
-device virtio-blk-pci,drive=drive0,scsi=off,x-data-plane=on
"
I'll be grateful if you can help me with the following question:
How to customize -device virtio-blk-pci parameter during OpenNebula VM
initialization to insert x-data-plane=on on it?

My VM Template:
CONTEXT=[NETWORK="YES",SSH_PUBLIC_KEY="$USER[SSH_PUBLIC_KEY]"]
CPU="1"
DISK=[AIO="native",BUS="virtio",CACHE="none",DEV_PREFIX="vd",FORMAT="raw",IMAGE_ID="1"]
GRAPHICS=[LISTEN="0.0.0.0",TYPE="VNC"]
MEMORY="256"
NIC=[NETWORK_ID="0"]
OS=[ARCH="i686",BOOT="hd"]

KVM process on node:
/usr/bin/kvm -S -M pc-i440fx-1.6 -cpu qemu32 -enable-kvm -m 256 -smp
1,sockets=1,cores=1,threads=1 -name one-27
-uuid c014337c-5255-e983-862e-b744f889aa49 -no-user-config -nodefaults
-chardev
socket,id=charmonitor,path=/var/lib/libvirt/qemu/one-27.monitor,server,nowait
-mon chardev=charmonitor,id=monitor,mode=control -rtc base=utc
-no-shutdown-boot c
-drive
file=/srv/cloud/one/var//datastores/0/27/disk.0,if=none,id=drive-virtio-disk0,format=raw,cache=none
-device
virtio-blk-pci,bus=pci.0,addr=0x4,drive=drive-virtio-disk0,id=virtio-disk0
-drive
file=/srv/cloud/one/var//datastores/0/27/disk.1,if=none,media=cdrom,id=drive-ide0-0-0,readonly=on,format=raw
-device ide-drive,bus=ide.0,unit=0,drive=drive-ide0-0-0,id=ide0-0-0 -netdev
tap,fd=22,id=hostnet0
-device
virtio-net-pci,netdev=hostnet0,id=net0,mac=02:00:c0:a8:0f:6e,bus=pci.0,addr=0x3
-usb -vnc 0.0.0.0:27 -vga cirrus -device
virtio-balloon-pci,id=balloon0,bus=pci.0,addr=0x5

I'm running ONE 4.2 on Debian 7.1 x86_64, kernel 3.2.0-4-amd64, with
customized qemu-1.6(compiled by myself to support virtio-blk-data-plane) to
enable virtio-blk-data-plane, with Debian 7.1 i386 VMs.

Thanks in advance,

Erico.

[1]
ftp://public.dhe.ibm.com/linux/pdfs/KVM_Virtualized_IO_Performance_Paper_v2.pdf
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