I have a Unity 5.1.3 Server at work. I think is too slow for the hardware the system have. For example my samba server (for internet file sharing) have only one 2 TB Seagate drive 7200 rpm 64 mb cache. I can get around 95 mb/s Write and 74 mb/s Read.
On Unity copying a file is around 25 mb/s ?!?!?. From a HP editor workstation.
1 Unity 5.1.3
1 Router Gigabit supplied by avid i can't remember the brand/model)
1 Debian 6 64 bit Samba 3.6.6
15 HP wx4600 workstations Avid 5.5 (can't upgrade to 6 because unity, that is 2 years old...)