Final update: after using "File Placement Limiter" (Above we were calling it something different) there was a progress bar and arrows showing the activity, which was nice, and that took a while, but not too crazy long considering the amount of data. After the data was moved off the drive as requested from file placement limiter plug in, I selected the drive for removal and that took maybe 5 minutes, Once the drive was not being used, the pool displayed the available space after which I shut down the server, removed the 2tb drive and installed a new 4tb drive in it's place, after reboot, I chose to use the RAW drive without assigning a drive letter so the pool would just use the entire drive. Done deal, more space, nothing missing! Thanks for the help!
