Managing DPM Performance on a WAN
Applies To: System Center Data Protection Manager 2010
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
Example: The following settings over a 100 Mbps link with 40 ms latency, gives the following results.
Settings |
|
On the remote DPM server: |
524288 |
On both the DPM servers: |
3 |
Results |
|
One job running |
3.45 MB/sec |
Three jobs running |
~3 MB/sec/job |