There isn't a module for that. There would be a module for that if there was a standard way of checking the health. But there isn't - for different boxes, different things can go wrong. Doesn't the box come with monitoring software, that will display the health?

Inside a NAS, there is a command that I could run to check for harddrive health.

Well, then run that command! Since you don't tell us anything what kind of box it is, and how it's connected, don't expect us to tell you how to run that command. Besides, that's more a systems issue than a Perl issue.

Note however that just the status of the individual disks doesn't mean much. Withing a RAID system, at least one disk may fail anyway. Furthermore, SCSI or FC controllers, cables or FC switches may fail too.

Abigail