Patent ID: 8806252

Claim:
A server cluster, comprising: a network switch connected to an external network; and a plurality of server nodes, each comprising: a network port connected to the network switch via a cable; a network chip used for detecting the cable to obtain a connection state with the external network at the server node after the network switch is started and accordingly outputting a connection state signal; and a control unit used for turning on or shutting down the server node according to the connection state signal and an on/off state of the server node, including a dual edge detector used for outputting a level signal when the voltage level of the connection state signal varies, a south bridge chip used for turning on or shutting down the server node according to the level signal and an on/off state of the server node, and an inverter used for inverting the level signal into a power signal and further transmitting the power signal to the south bridge chip, such that the south bridge chip turns on or shuts down the server node according to the power signal and an on/off state of the server node, wherein, when the server node is turned off, the south bridge chip turns on the server node according to the power signal, and when the server node is turned on, the south bridge chip outputs a shutdown signal to shut down the server node according to the power signal.