Questions about storage server on-disk format

@jzhou it looks like this got lost in some other problems I was researching last December, but I just encountered this again. Same situation, single-node FDB instance, the data directories are stored on a 10GB volume, but as soon as the SS sqlite file got to 5GB, the node ground to a halt.

What’s the cause for this? There’s still approximately 4.5GB of space available on that volume, so why am I getting that No space left on device error? We’re running 7.2.