RHEV: Virtual Machines failing to start with "could not open disk image / No such file or directory" error.

Issue

• The following error occurred when attempting to start any Virtual Machine from a specific pool;

poolvm-1 is down. Exit message: internal error process exited while connecting to monitor: qemu-kvm: -drive file=/rhev/data-center/19cf83a1-e649-4efb-9cb7-774eb963fb5b/5da3f469-2f8e-4af7-a00f-ca56d064bc71/images/c2d5768c-e146-43d1-be27-91a9fa84fd1d/aadc8e64-bf1c-4635-bbff-aeb27855d083,if=none,id=drive-virtio-disk0,format=qcow2,serial=c2d5768c-e146-43d1-be27-91a9fa84fd1d,cache=none,werror=stop,rerror=stop,aio=native: could not open disk image /rhev/data-center/19cf83a1-e649-4efb-9cb7-774eb963fb5b/5da3f469-2f8e-4af7-a00f-ca56d064bc71/images/c2d5768c-e146-43d1-be27-91a9fa84fd1d/aadc8e64-bf1c-4635-bbff-aeb27855d083: No such file or directory

• The /var/log/vdsm/vdsm log file on the host on which the VM was started contained;

Thread-123717::DEBUG::2013-11-13 06:30:07,596::libvirtconnection::128::vds::(wrapper) Unknown libvirterror: ecode: 1 edom: 10 level: 2 message: internal error process exited while connecting to monitor: qemu-kvm: -drive file=/rhev/data-center/19cf83a1-e649-4efb-9cb7-774eb963fb5b/5da3f469-2f8e-4af7-a00f-ca56d064bc71/images/c2d5768c-e146-43d1-be27-91a9fa84fd1d/aadc8e64-bf1c-4635-bbff-aeb27855d083,if=none,id=drive-virtio-disk0,format=qcow2,serial=c2d5768c-e146-43d1-be27-91a9fa84fd1d,cache=none,werror=stop,rerror=stop,aio=native: could not open disk image /rhev/data-center/19cf83a1-e649-4efb-9cb7-774eb963fb5b/5da3f469-2f8e-4af7-a00f-ca56d064bc71/images/c2d5768c-e146-43d1-be27-91a9fa84fd1d/aadc8e64-bf1c-4635-bbff-aeb27855d083: No such file or directory

• The /var/log/libvirtd log file on the same host contained;

2013-11-13 11:30:06.729+0000: 9138: debug : virStorageFileGetMetadata:993 : path=/rhev/data-center/19cf83a1-e649-4efb-9cb7-774eb963fb5b/5da3f469-2f8e-4af7-a00f-ca56d064bc71/images/c2d5768c-e146-43d1-be27-91a9fa84fd1d/aadc8e64-bf1c-4635-b
bff-aeb27855d083 format=9 uid=107 gid=107 probe=0
2013-11-13 11:30:06.729+0000: 9138: debug : virStorageFileGetMetadataRecurse:925 : path=/rhev/data-center/19cf83a1-e649-4efb-9cb7-774eb963fb5b/5da3f469-2f8e-4af7-a00f-ca56d064bc71/images/c2d5768c-e146-43d1-be27-91a9fa84fd1d/aadc8e64-bf1c
-4635-bbff-aeb27855d083 format=9 uid=107 gid=107 probe=0
2013-11-13 11:30:06.729+0000: 9138: debug : virStorageFileGetMetadataInternal:673 : path=/rhev/data-center/19cf83a1-e649-4efb-9cb7-774eb963fb5b/5da3f469-2f8e-4af7-a00f-ca56d064bc71/images/c2d5768c-e146-43d1-be27-91a9fa84fd1d/aadc8e64-bf1
c-4635-bbff-aeb27855d083, fd=56, format=9
2013-11-13 11:30:06.730+0000: 9138: debug : virStorageFileGetMetadataRecurse:925 : path=/dev/dm-59 format=9 uid=107 gid=107 probe=0
2013-11-13 11:30:06.730+0000: 9138: debug : virStorageFileGetMetadataInternal:673 : path=/dev/dm-59, fd=56, format=9
2013-11-13 11:30:06.730+0000: 9138: error : virFindBackingFile:528 : Can't canonicalize path '../268d4e42-1bbf-472a-a064-d0e5a4e8d157/85b81fde-50e9-4884-a9dc-be696157a925': No such file or directory
2013-11-13 11:30:06.730+0000: 9138: warning : virStorageFileGetMetadataInternal:782 : Backing file '../268d4e42-1bbf-472a-a064-d0e5a4e8d157/85b81fde-50e9-4884-a9dc-be696157a925' of image '/dev/dm-59' is missing.