Windows Server slow copy after installing NLB service

Hi everyone,

After installing the Microsoft load balancing service (NLB) between two servers we experienced a very slow copy rate when copying files/folder.
The problem was that the cluster were configured as Unicast, changing the setting to Multicast fixed the issue.

To change the setting connect to your cluster using the Network Load Balancing Manager tool then right click on the node cluster and select Cluster Properties.
Navigate to the Cluster Parameters tab and switch the parameter to Multicast.

More information about Unicast vs Multicast available here.
Hope this help.

Florian