Improving Usage of WAN Latency

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Applies To: System Center Data Protection Manager 2010

If your deployment of System Center Data Protection Manager (DPM) 2010 for disaster recovery requires DPM to send large amounts of 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

For example, using the following settings over a 100 Mbps link with 40 ms latency produces the following results:

Settings

On the remote DPM server: HKLM\SYSTEM\CurrentControlSet\Services\Tcpip\Parameters\TcpWindowSize

524288

On both DPM servers: HKLM\SYSTEM\CurrentControlSet\Services\Tcpip\Parameters\TcpWindowSize\Tcp1323Opts

3

Results

One job running

3.45 MB/sec

Three jobs running

~3.00 MB/sec per job