[libvirt] adding scsi disk failed (code=9)

[Massimo Canonico]

Hi,
I'm newbie and sorry if this question was already post in this ML (is 
there any search engine for the ML archive?).

I'm trying to attach a volume in my instance. The instance is running 
and the volume is available, but i got this error:

----
libvirt: operation failed: adding scsi disk failed (code=9)
 virDomainAttachDevice() failed (err=-1) XML=<disk type='block'><driver 
name='phy'/><source dev='/dev/etherd/e0.8'/><target dev='sdb'/></disk>
 doAttachVolume() failed error=1
----

I'm not sure where I can start to debug this error. I'm using Fedora 11, 
x86_64, with these packages
[root at minicloud eucalyptus]# rpm -qa | grep libv
libvirt-devel-0.6.2-12.fc11.x86_64
libvorbis-1.2.0-7.fc11.x86_64
libvirt-0.6.2-12.fc11.x86_64
libvirt-python-0.6.2-12.fc11.x86_64
libvolume_id-141-3.fc11.x86_64


May you help me, please?

Thanks in advance,
 M