Currently when we attempt to change the cdrom in a qemu VM the monitor doesn't generate an error if the target filename doesn't exist. I've submitted a patch[1] for this. This patch is the libvirt qemu-driver side which catches the error message from the monitor and reportes the error to libvirt. This means that virsh attach-disk cdrom commands won't appear to succeed when qemu change command actually failed. I've tested this patch on an older libvirt (rebuild libvirt-0.7.0 on my ubuntu host) but haven't rebuilt against git head since I can't quite compile that on my host. 1. http://lists.gnu.org/archive/html/qemu-devel/2010-03/msg01935.html Signed-off-by: Ryan Harper <ryanh(a)us.ibm.com&gt; diff --git a/src/qemu/qemu_monitor_text.c b/src/qemu/qemu_monitor_text.c index 1596e59..f868907 100644 --- a/src/qemu/qemu_monitor_text.c +++ b/src/qemu/qemu_monitor_text.c @@ -905,7 +905,14 @@ int qemuMonitorTextChangeMedia(qemuMonitorPtr mon, qemuReportError(VIR_ERR_OPERATION_FAILED, _("could not eject media on %s: %s"), devname, reply); goto cleanup; - } + } + + /* Could not open message indicates bad filename */ + if (strstr(reply, "\nCould not open ")) { + qemuReportError(VIR_ERR_OPERATION_FAILED, + _("could not change media on %s: %s"), devname, reply); + goto cleanup; + } ret = 0; -- Ryan Harper Software Engineer; Linux Technology Center IBM Corp., Austin, Tx ryanh(a)us.ibm.com