Hi, Jos,
Actually i am facing similar problem with you.
My case is copy tasks all stopped when I was copying files from other NAS or my computer to Xpenology.
Then I checked my Xpenology by web interface, there were no any disks or partitions so far after that problem happened.
I am testing 3ea of 4TB with this virtual machine, i assigned all physical hard disks to VM.
I thought it might be disk capacity too big but it seems not relating with capacity.
Do you have any update on this? Actually I am using VMware workstation 10 now but i don't like the performance.
I feel, Hyper-V is much smoother and faster than VMware. But i can't use due to this prpblem.
Any idea please don't hesitate to share with me.
Thx.