Late september Microsoft released a new tool for disk performance testing. It has been mentioned more then once at SQL Pass Summit.
Have a look here: https://gallery.technet.microsoft.com/DiskSpd-a-robust-storage-6cd2f223
It’s said to be better than SQLIO and at first looks it seems very interesting. Here is a blog post about how to use it. Said to be able to measure SMB performance as well.