both previous posts are correct. See similar image for one of my nodes that just reached the “full” threshold limit last night:
I believe that that was one of the implemented safe guards in the program, that once there is only 500MB space remaining in allocated space, the node will stop receiving ingress until additional space is freed up or additional space is allocated.
Side note, my example above is one that falls into that second scenario, since I only allocated 500GB to the note, but it’s actually running on a 4TiB HDD. So at some point I’ll increase that limit, when my other nodes start to fill up as well.
So looks like you have a choice to make, assuming this is your only node and assuming your allocated 9TB is on a 10TiB HDD, either determine whether it’s worth it for you to migrate the node to a larger HDD, or if you have another HDD but don’t want to or can’t migrate, think about starting another node.