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domain was started with
<disk device="cdrom" snapshot="no" type="file">
<source file="/rhev/data-center/2319b7ff-09f6-488c-83c4-aa78139db3b4/019d4b6f-5450-4eb6-80ee-c63ea062de49/images/11111111-1111-1111-1111-111111111111/en_windows_7_enterprise_x64_dvd_x15-70749.iso" startupPolicy="optional"/>
<target bus="ide" dev="hdc"/>
<serial></serial>
</disk>
the source file is accessible on the nfs mount. However, libvirt claims
2012-02-19 11:54:41.779+0000: 22269: debug : qemuDomainCheckDiskPresence:1634 : Dropping disk 'hdc' on domain 'xtream-vm-001' (UUID 'f9ea04b0-1a1e-4793-870f-b3b1f8b6c6e4') due to inaccessible source '/rhev/data-center/2319b7ff-09f6-488c-83c4-aa78139db3b4/019d4b6f-5450-4eb6-80ee-c63ea062de49/images/11111111-1111-1111-1111-111111111111/en_windows_7_enterprise_x64_dvd_x15-70749.iso'
and drops the "file" attribute from the <source> element.
If startupPolicy="optional" is dropped, the domain starts up fine.
libvirt-0.9.9-1.fc16.x86_64
note also that libvirt's behaviour is inconsistent with the case of starting with an empty cdrom. There, the <source> element is completely dropped from XMLDesc().
Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.
For information on the advisory, and where to find the updated
files, follow the link below.
If the solution does not work for you, open a new bug report.
http://rhn.redhat.com/errata/RHSA-2012-0748.html
Description of problem: missing 'source dev' attribute when passing 'optional' param in XML with regardless wither source-dev exists or not. xml: <disk type='file' device='cdrom'> <driver name='qemu' type='raw'/> <source startupPolicy='optional'/> <target dev='hdc' bus='ide'/> <readonly/> <serial></serial> <alias name='ide0-1-0'/> <address type='drive' controller='0' bus='1' unit='0'/> </disk> log (vdsm): Thread-221::ERROR::2012-02-19 09:59:17,807::utils::399::vm.Vm::(collect) vmId=`2aed27de-bc3f-40cb-85b3-1839f8e38279`::Stats function failed: <AdvancedStatsFunction _sampleDiskLatency at 0x207a7a0> Traceback (most recent call last): File "/usr/share/vdsm/utils.py", line 395, in collect statsFunction() File "/usr/share/vdsm/utils.py", line 272, in __call__ retValue = self._function(*args, **kwargs) File "/usr/share/vdsm/libvirtvm.py", line 158, in _sampleDiskLatency diskLatency[vmDrive.name] = stats[vmDrive.alias] AttributeError: 'Drive' object has no attribute 'alias'