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We have a RHEL6 only patch which encodes io=threads for all disk devices. This is unneeded since that is actually the qemu default. What we should be doing is setting io=native for hard disks backed by a block device, which is the more performant option.
Defaults are tracked upstream now with a --rhel6defaults build time switch: http://git.fedorahosted.org/git?p=python-virtinst.git;a=commit;h=0075dd8730adaf8aa3d7f90655d0626374fdd5b4 Just need to turn that on when we rebase
Fixed in python-virtinst-0.600.0-1.el6
Verify with: python-virtinst-0.600.0-2.el6 qemu-kvm-0.12.1.2-2.172.el6 libvirt-0.9.4-0rc2.el6 step : run command line to install a guest with block device: # virt-install -n demo2 -r 1024 --disk path=/var/lib/libvirt/images/demo2.img,size=6 --disk path=/dev/sda2 -c /tmp/RHEL6.1-20110510.1-Server-x86_64-DVD1.iso --vnc #virsh dumpxml demo2 ...... <disk type='file' device='disk'> <driver name='qemu' type='raw' cache='none'/> <source file='/var/lib/libvirt/images/demo2.img'/> <target dev='hda' bus='ide'/> <alias name='ide0-0-0'/> <address type='drive' controller='0' bus='0' unit='0'/> </disk> <disk type='block' device='disk'> <driver name='qemu' type='raw' cache='none' io='native'/> <source dev='/dev/sda2'/> <target dev='hdb' bus='ide'/> <alias name='ide0-0-1'/> <address type='drive' controller='0' bus='0' unit='1'/> </disk> ...... #ps -ef | grep demo2qemu 28626 1 7 04:29 ? 00:00:06 /usr/libexec/qemu-kvm -S -M rhel6.2.0 -enable-kvm -m 1024 -smp 1,sockets=1,cores=1,threads=1 -name demo2 -uuid 3c5f785e-2cba-cb49-10a6-85ccc39ab524 -nodefconfig -nodefaults -chardev socket,id=charmonitor,path=/var/lib/libvirt/qemu/demo2.monitor,server,nowait -mon chardev=charmonitor,id=monitor,mode=control -rtc base=utc -no-reboot -no-shutdown -drive file=/var/lib/libvirt/images/demo2.img,if=none,id=drive-ide0-0-0,format=raw,cache=none -device ide-drive,bus=ide.0,unit=0,drive=drive-ide0-0-0,id=ide0-0-0,bootindex=2 -drive file=/dev/sda2,if=none,id=drive-ide0-0-1,format=raw,cache=none,aio=native -device ide-drive,bus=ide.0,unit=1,drive=drive-ide0-0-1,id=ide0-0-1 -drive file=/tmp/RHEL6.1-20110510.1-Server-x86_64-DVD1.iso,if=none,media=cdrom,id=drive-ide0-1-0,readonly=on,format=raw -device ide-drive,bus=ide.1,unit=0,drive=drive-ide0-1-0,id=ide0-1-0,bootindex=1 -netdev tap,fd=33,id=hostnet0 -device rtl8139,netdev=hostnet0,id=net0,mac=52:54:00:cf:65:4e,bus=pci.0,addr=0x3 -chardev pty,id=charserial0 -device isa-serial,chardev=charserial0,id=serial0 -usb -vnc 127.0.0.1:3 -vga cirrus -device virtio-balloon-pci,id=balloon0,bus=pci.0,addr=0x4 verification passed.
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Since the problem described in this bug report should be resolved in a recent advisory, it has been closed with a resolution of ERRATA. For information on the advisory, and where to find the updated files, follow the link below. If the solution does not work for you, open a new bug report. http://rhn.redhat.com/errata/RHBA-2011-1643.html