Server 2012 WDS Multicasting slowwwww
Have managed to get my 2012 server up and running with MDT using WDS for PXE booting clients. Works a charm on my 2 test machines using Unicast but when I enable Multicast and try it then the deployment goes from 25 minutes for both machines to over 2 hours for same image same machines.
Server and clients are all connected to core switch (which has IGMP enabled). I havent enabled IGMP on any of my other switches yet.
I have googled and the only info I can find is about reducing the APBlockSize. In WDS for Server 2012 it is already set low by default.
When Multicasting the Transfer rate jumps around from 54KBps to 4000KBps.
I have split the WDS setting so that clients are split into 3 sessions (slow, medium & fast) but both clients jump transfer rates at the same level.
I am getting closer to the point where I need to start imaging whole IT Suites so I need to get Multicasting sorted.