RHEV Guest fails to run with error "could not open disk image" and "Invalid argument".

Issue

• A RHEV guest fails to start.

• The Events pane in the RHEV-M Admin Portal shows;

        VM VMNAME is down. Exit message: internal error process exited while connecting to monitor: qemu-kvm: -drive file=/rhev/data-center/d316d73c-9881-11e1-8aa6-525400a6c839/37913611-12f9-4fa1-8506-ffc0f697a5bd/images/c1e4a792-d19a-455a-91a2-f22965bbed89/584205ff-5839-4d68-ab44-25494497c888,if=none,id=drive-virtio-disk0,format=qcow2,serial=e9a5ef98-7acc-413f-a258-ce028786abb7,cache=none,werror=stop,rerror=stop,aio=native: could not open disk image /rhev/data-center/d316d73c-9881-11e1-8aa6-525400a6c839/37913611-12f9-4fa1-8506-ffc0f697a5bd/images/c1e4a792-d19a-455a-91a2-f22965bbed89/584205ff-5839-4d68-ab44-25494497c888: Invalid argument

• The vdsm logs on the host that it failed to start on contain;

Thread-2253014::DEBUG::2013-09-26 16:46:00,602::vm::678::vm.Vm::(_startUnderlyingVm) vmId=`5f0da4bb-24d0-4479-b4fa-9cf0df7507e2`::_ongoingCreations released
Thread-2253014::ERROR::2013-09-26 16:46:00,603::vm::704::vm.Vm::(_startUnderlyingVm) vmId=`5f0da4bb-24d0-4479-b4fa-9cf0df7507e2`::The vm start process failed
Thread-2253014::DEBUG::2013-09-26 16:46:00,669::vm::1092::vm.Vm::(setDownStatus) vmId=`5f0da4bb-24d0-4479-b4fa-9cf0df7507e2`::Changed state to Down: internal error process exited while connecting to monitor: qemu-kvm: -drive file=/rhev/data-center/d316d73c-9881-11e1-8aa6-525400a6c839/37913611-12f9-4fa1-8506-ffc0f697a5bd/images/c1e4a792-d19a-455a-91a2-f22965bbed89/584205ff-5839-4d68-ab44-25494497c888,if=none,id=drive-virtio-disk2,format=qcow2,serial=c1e4a792-d19a-455a-91a2-f22965bbed89,cache=none,werror=stop,rerror=stop,aio=native: could not open disk image /rhev/data-center/d316d73c-9881-11e1-8aa6-525400a6c839/37913611-12f9-4fa1-8506-ffc0f697a5bd/images/c1e4a792-d19a-455a-91a2-f22965bbed89/584205ff-5839-4d68-ab44-25494497c888: Invalid argument

• The vdsm logs indicate that the image is qcow2;

                <disk device="disk" snapshot="no" type="block">
                        <address  domain="0x0000"  function="0x0"  slot="0x05"  type="pci" bus="0x00"/>
                        <source dev="/rhev/data-center/d316d73c-9881-11e1-8aa6-525400a6c839/37913611-12f9-4fa1-8506-ffc0f697a5bd/images/c1e4a792-d19a-455a-91a2-f22965bbed89/584205ff-5839-4d68-ab44-25494497c888"/>
                        <target bus="virtio" dev="vda"/>
                        <serial>e9a5ef98-7acc-413f-a258-ce028786abb7</serial>
                        <boot order="2"/>
                        <driver cache="none" error_policy="stop" io="native" name="qemu" type="qcow2"/>
                </disk>

• Running qemu-img info against the image's file indicates that it is a raw image;

# qemu-img info /rhev/data-center/d316d73c-9881-11e1-8aa6-525400a6c839/37913611-12f9-4fa1-8506-ffc0f697a5bd/images/c1e4a792-d19a-455a-91a2-f22965bbed89/584205ff-5839-4d68-ab44-25494497c888
image: /rhev/data-center/d316d73c-9881-11e1-8aa6-525400a6c839/37913611-12f9-4fa1-8506-ffc0f697a5bd/images/c1e4a792-d19a-455a-91a2-f22965bbed89/584205ff-5839-4d68-ab44-25494497c888
file format: raw
virtual size: 10K (10240 bytes)
disk size: 12K