On 10/19/10 18:03, Alex Davis wrote:

>> You ejected the CD-ROM on the QEMU side, the guest doesn't
>> necessarily
>> know about the medium change.  What happens when you
>> use "eject
>> /dev/sr0" inside the guest instead?
> I get a 'no medium found' error from the 'dd..' command. After
> going into the the monitor, ejecting and reloading the disk, 
> I still get the size of the first disk in the guest.

As I recall the old data is coming from the host page cache; it is not
seeing the media change. Try dropping the cache in the host on a media
change (echo 3 > /proc/sys/vm/drop_caches) or modify qemu to close and
reopen the cdrom device.

David


>>
>> I don't know how CD-ROM media change works on real
>> hardware, but that
>> is the behavior that QEMU should be following.
>>
>> Stefan
> 
> 
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