A computer program product for a network management device, including: a computer readable storage medium to store a computer readable program, wherein the computer readable program, when executed on a computer, causes the computer to perform operations for server management in a computer network. The operations include: receiving resource usage data generated at a network communication device coupled between a server and a network management device, wherein the resource usage data describes resource usage of the server; and classifying the server into a cluster of servers based on the resource usage data from the network communication device and a cluster characterization for the cluster. The cluster includes a plurality of servers with similar resource usage data, and the cluster is one of a plurality of clusters managed by the network management device.