Came across these programs. Looks interesting, I may consider using something on my local server and possibly my desktop to consolidate drives.
https://stablebit.com/DrivePool $29.95 for a single machine license
http://www.division-m.com/drivebender/drive-bender-features.html $5 for a machine license, $10 for 3 licenses - was commercial, has become “donationware”.
There is other software, but having read some articles about the above two packages, they’re pretty similar. DrivePool seems to be the more popular choice.
It is similar to Windows Storage Spaces, which is apparently terrible.
There is FlexRaid as well. http://www.flexraid.com/ Their pooling product is the same price as DrivePool.