restore killing performance

[frankive]

A customer with a prett slow san, HP Storevirtulal 4330 with 8X1TB Sans in Raid5 (2 sans with network raid 10 1Gbit.
2 Hyper-V 2012 node in failover cluster with 1 Gb scsi link (actually 2 with mpio) to the SAN network.

Problem:
When we restore files from our Veeam server (1Gbit link) we restore to c:\clusterstorage\volume1). This actually kill the iscsi connection with traffic and make other vm running on the hyper-v to stop work as the host get inresponsive.

I have tried to set network throttling to f.ex 400 Mbit, but it doesn't seem to work during restore?

Suggestions? What do you guys do to prevent this in small environments like this?

Edit: Seems like throttling is not working during restore: veeam-backup-replication-f2/throttling- ... 39890.html