Lukas Beeler's IT Blog

I’ve been playing with DPM 2010 and SCVMM 2008 R2, planning for our new development lab.

I’ve setup a new Hyper-V server on a x3650 M2 (using server core) – i’ve also installed the latest Broadcom NetXtreme II drivers, all the firmware updates, all the best practices you do.

Setting up the machine, transferring VMs from another host (using BITS) worked well and fast, no issues.

And then i installed the DPM agent, started a backup. Two hours later, it was still stuck at “Replica creation in progress”.

I tried reading through the DPM agent logs, through the DPM server logs, looked if DPM created shadow copies (using vssadmin list shadows).

After two hours of fruitless searching (which included restarting everything), i wasn’t any further to a solution.

Well, backup wasn’t working right, but this was just a testing environment, so i decided to do other stuff.

A while later, i ran netstat -t to lookup connections – and also realized that TCP Chimney Offloading was still active. So i disabled it using netsh int tcp set global chimney=disabled. Just a few seconds later, the utilization of the management network adapter jumped to 100% and 5 minutes later, all the VMs were replicated to the DPM server.

So, if you’re having issues with DPM backups being stuck, check the status of your network offloading.