If cceUsageDiskVolumeEverMounted is false(2) or
cceUsageDiskVolumeCurrentlyMounted is true(1),
then this object is notApplicable(0).
If cceUsageDiskVolumeEverMounted is true(1) and
cceUsageDiskVolumeCurrentlyMounted is false(2),
then this object the reason the CVS volume is not
mounted. If the reason is normal(1), then the volume
was unmounted by the administrator issuing the
cfs umount command. If the reason is error(2), then
volume was unmounted by the Cache File System
due to an error.