Error message below. This doesn't seem right, I'm only downloading a little over 20k blocks (which is the whole point of warp barrier), how can this really need more than 100GB? Just to clarify, it won't even sync. It's not the case that it synced and then X weeks later ran out of space (that I could understand).
--warp-barrier doesn't prevent you from downloading "ancient blocks" (you still do that in the background) it only prevents you from downloading older snapshots (which define where your sync will start after you are done warping) than you specify. If you don't want to ever download or verify "ancient" blocks, ie, blocks that are below the block number you warped to, you need to use