I have a kvm guest running MS-WinV7 on a CentOS-6.5 host. The WinV7 guest was installed from a CD. It installed correctly and was updated and added to an MS Active Domain without difficulty. I was able to do work on it through the virt-manager console and I was able to shut the system down from the console without problem.
I cannot get it to restart however.
virsh start brws-ms-v7-37v.brockley.harte-lyne.ca error: Failed to start domain brws-ms-v7-37v.brockley.harte-lyne.ca error: cannot open file ‘/dev/sr0’: No medium found
I found this bugzilla report.
Which is curiously marked as CLOSED DEFERRED.
The last comment in that bug contains this:
Now, in my configuration files there is no ‘format’ attribute found in any tag. I find ‘type=raw’ inside of many tags but it seems strange to me that a RedHat bug report would use such imprecise language so as to confuse the attribute ‘type’ with one named ‘format’ so I wonder if a syntax change has occurred and if that has introduced a regression?
virsh edit brws-ms-v7-37v.brockley.harte-lyne.ca show this configuration entry for device sr0:
Despite the inference I draw from the bug report, that format ~= type, one cannot in fact change the driver attribute ‘type’ to any value other than raw. Any attempt to do so results in this message:
unsupported configuration: unknown driver format value ‘host_cdrom’
Failed. Try again? [y,n,f,?]:
Further, the value ‘f’ is not permitted so one cannot forcibly save the configuration to determine if in fact it might work.