A method utilized in a computer storage node includes: providing user interface device to be operated by an operator; providing sensor module to sense operation parameter of computer storage node to generate first detection signal and second detection signal following first detection signal; receiving first detection signal to control display panel of user interface device to display data pattern of first detection signal on display panel according to a time scale; using first portion of first detection signal corresponding to a partial pattern of the data pattern to generate reference signal when the operator uses user interface device to mark a region on display panel to select the partial pattern; receiving second detection signal sent from sensor module after the reference signal is generated; and comparing characteristics of reference signal with characteristics of second detection signal to perform behavior analysis operation.