I have a 3-node HyperV cluster running on a NetGear readynas 4200 - so no hardware VSS support.
Veeam is running off a separate physical server (HP DL360 G6 dual-quad 2.27ghz xeon - 4GB of RAM) which is writing to a directly attached iSCSI unit (4x SATA 3tb drives)
All the servers are connected at 1GB - the VMs are connected via a 20GB trunk
The backup target gets approximately 90 MB/s write speed.
Jumbo frames are enabled between the backup server and it's target, but not on the HyperV nodes.
With this setup, I get around 9 MB/s during a backup job average, with an occasional peak to ~15-16 MB/s
All of the available "best practice guides" I've read are focused around VM Ware, as there are no alternative options for HyperV proxies, either no proxy (on-host) or Direct SAN access which I cant use as I don't have Hardware VSS.
Am i missing something or is this the best Veeam can do with this setup?