the yafu server runs in a virtual box (4.3.10) VM on my 64 bit Win 7 Laptop. Round about 6h after the VM was started I get an BLKCACHE_IOERR from virtualbox which usual means that the disk is full. But it's not. The host has 40GB free disk and the guest is also only 20% filled.
I did some changes on the system and don't know if it fixes the issue.
I'm abroad the next days. So it might be that the server stops working again until I'm back.