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

[Daniel P. Berrange]

On Tue, Dec 10, 2013 at 11:20:35AM +0100, Marko Weber | ZBF wrote:
> 
> 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".

cache=none uses O_DIRECT flag. if you get "Invalid argument" it usually
means that your filesystem is bad and does not support O_DIRECT

Regards,
Daniel
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