This great performance motivated me to take the SSD element out of the equation. I have a 16TB DroboPro attached via iSCSI to the Vail server as a backup of files (i.e. not as part of the pool of Vail backups). I copied a 1.1TB folder of AppleTV TV episodes
from the Drobo to the Video folder on Vail. I was delighted to see a sustained write by Vail of 80MB/s over the whole transfer. This is much faster than I ever see on WHS v1. The initial backups are slower; more like 18MB/s.
All my data discs are WD Green 2TB so nothing special and machine is IDE as I forgot to AHCI in the bios before the install.
Ian