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baldjoe00

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Backup Hyper-V VM's with MS DPM over WAN connection

I am looking to backup 2008 Server Hyper-V Complete VM's to a remote location about 100 miles away to a Microsoft DPM for Disaster Recovery purposes. I have a few questions. This was setup prior to my arrival and has never worked properly.

Right now, it is already setup to backup to the remote location but the DPM backs up the Data directories in each VM over the WAN, and it completes, however,  the full VM itself will not backup over the WAN, it fails every time.

Is there some sort of configuration that was missed that is allowing the data files to be backed up but NOT the Full Live VM? Why would the vm backup fail in this scenario? When we brought the DPM server locally into the LAN, it successfully backed up each live VM but when it was dropped back to the remote site, it failed again about midway through.

The data link over the WAN is 1.5 and will soon be upgraded to 4.5 so bandwidth will not be an issue any more. From what I read, 1.5 is enough to do this. Each VM varies in size from about 10GB to 56GB.

Is DPM capable of copying the live VM over the WAN? Basically, creating a shadow copy and backing it up? Does it have to be unmounted first before the backup?
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Also, Microsoft recommends tweaking the TCPWindowSize setting:

Managing DPM Performance on a WAN
http://technet.microsoft.com/en-us/library/ff634226.aspx

Performance is a serious consideration when the DPM server and the servers that it is protecting are connected by low-speed wide area network (WAN) links, particularly for resource-intensive jobs such as replica creation and consistency checks. For example, transferring a 20 GB volume across a 512 Kbps link would take at least 120 hours.

In this network configuration, you should enable compression for all protection groups. For replica creation of volumes larger than 5 GB, we recommend that you create the replica manually.

Improving usage of WAN latency
If your deployment of DPM disaster recovery requires DPM to send large amounts to data over a WAN, you can improve DPM’s use of your WAN latency by adjusting the following registry settings

On the remote DPM server:

HKLM\SYSTEM\CurrentControlSet\Services\Tcpip\Parameters\TcpWindowSize

HKLM\SYSTEM\CurrentControlSet\Services\Tcpip\Parameters\TcpWindowSize\Tcp1323Opts

On the DPM server:

HKLM\SYSTEM\CurrentControlSet\Services\Tcpip\Parameters\TcpWindowSize\Tcp1323Opts
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baldjoe00

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I am going to try some of these ideas tomorrow and see what happens overnight. If you have any further suggestions, please let me know. For now, thanks for the tips!
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You might want to look at backing up to a local DPM server that is then backed up by a remote DPM server. This will also give much faster restore times if required, and all of your initial backup can be made locally before transporting your secondary DPM server to your offsite location