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kvm with virtio scsi and rbd

I'm currently using virtio-blk but I'd like to change to the new virtio-scsi, especially because it supports trim/ discard. The host is an ubuntu quantal system (kernel 3.5.0, qemu 1.2.0). This is ...
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Qemu: can I set the serial number on a virtual SCSI device?

I'm using libvirt+KVM+Qemu on Ubuntu 11.04. I have some scsi devices like this: <disk type='file' device='disk'> <driver name='qemu' type='raw'/> <source ...