Garageband - When Recording "Drive/Partition "DroboPro" is full

I’m encountering a weird issue - Garageband when recording tells me that my DroboPro is full! - There are 6TB that are free still - has anybody encountered weird issues like this with Garageband? It worked yesterday - the only change is my DroboPro is now Dual Drive Redundant.

Is the Pro being used as a sharepoint on a server?