The problem is that OMV does not detect that /dev/sdc is part of a HBA and therefor doesn't append the necessary smartctl arguments. Maybe the detection must be improved:
Could you please run the following interactively (as root user) and report the output?
Following the thread i think this is a bug in smartctl because the device is accessible directly and not behind a CCISS HBA, thus it is not necessary to append the -d cciss,N argument.
Lets see what you report, but IMO this is a bug in smartctl that can't be fixed by OMV.