See bug 709585. When I try to run VM in Virtual Machine Manager, I get:
Error starting domain: cannot read header '/dev/sr0': Input/output error.
If I try to change Storage format to host_device or host_cdrom:
Error changing VM configuration: unsupported configuration: unknown driver format value 'host_cdrom'
From https://bugzilla.redhat.com/show_bug.cgi?id=709585#c13 :
Happens on Fedora 20, too.
Guest OS = MS-WinV7proSP1 (updated to date)
# virsh dumpxml win7
<disk type='block' device='cdrom'>
<driver name='qemu' type='raw'/>
<target dev='hdb' bus='ide'/>
<address type='drive' controller='0' bus='0' target='0' unit='1'/>
This is also affecting RHEL7 (and CentOS7).
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FWIW a VM on f23 starts up fine with empty /dev/sr0, so this appears to be fixed there