[libvirt-users] gentoo linux, problem starting vm´s when cache=none

[Marko Weber | ZBF]

hello mailinglist,

on gentoo system with qemu-1.6.1, libvirt 1.1.4, libvirt-glib-0.1.7, 
virt-manager 0.10.0-r1

when i set on virtual machine "cache=none" in the disk-menu, the machine 
faults to start with:

<<
Fehler beim Starten der Domain: Interner Fehler: Prozess während der 
Verbindungsaufnahme zum Monitor beendet :qemu-system-x86_64: -drive 
file=/raid6/virtual/debian-kaspersky.img,if=none,id=drive-virtio-disk0,format=qcow2,cache=none,aio=native: 
could not open disk image /raid6/virtual/debian-kaspersky.img: Invalid 
argument


Traceback (most recent call last):
   File "/usr/share/virt-manager/virtManager/asyncjob.py", line 100, in 
cb_wrapper
     callback(asyncjob, *args, **kwargs)
   File "/usr/share/virt-manager/virtManager/asyncjob.py", line 122, in 
tmpcb
     callback(*args, **kwargs)
   File "/usr/share/virt-manager/virtManager/domain.py", line 1210, in 
startup
     self._backend.create()
   File "/usr/lib64/python2.7/site-packages/libvirt.py", line 708, in 
create
     if ret == -1: raise libvirtError ('virDomainCreate() failed', 
dom=self)
libvirtError: Interner Fehler: Prozess während der Verbindungsaufnahme 
zum Monitor beendet :qemu-system-x86_64: -drive 
file=/raid6/virtual/debian-kaspersky.img,if=none,id=drive-virtio-disk0,format=qcow2,cache=none,aio=native: 
could not open disk image /raid6/virtual/debian-kaspersky.img: Invalid 
argument
>> 

when i switch back to cache=default, the machine start like a charm.

any ideas why? i cant find anything in logs, only  this "invalid 
argument".

the machine is created with profile "linux / debian squeeze" cause its a 
debian 6

marko