When I create a private network on Server 2008 r2 with the Hyper V role (hotfix for 2012 guest vms installed). I then install server 2012 as a guest and install the dhcp,wds roles. Then MDT 2012 u1. When I perform a deployment using multicast, booting into a vm pxe boot, the performance is about 600-700kbps. The network utilization is at 1-10%. A 13Gb image takes ages. If I put the legacy nic into the mdt server and of course the client as it pxe boots the performance is 10000kbps.
This is the same on a external network. At first I thought it was a physical switch issue. When I created a MDT server on a physical server (1gbps port) and turned on flow control the multicast performance is great 10000kbps.
There seems to be a bottleneck in the hyper v switch as the mdt server as its conenction is 10gbps or a lot higher than 100mbps.
Can I configure the hyper v switch for flow control (or some other way)? When using the hyper v vm nic their are a lot of NACK errors and repair packets. Their are hardly any errors when all adapters are at 100mbps.
Just wondered if anyone else had encountered this issue.
I'm currently testing with a server 2008 r2 mdt vm guest.