Disclosed is a method of managing a data storage network comprising a plurality of data storage volumes and a plurality of paths for connecting a server to a selected one of said data storage volumes, comprising determining, for an individual path, a plurality of performance parameters of said path during an interval; calculating a path performance metric from a combination of the determined performance parameters; and, if the path performance metric falls below a predefinable quality standard blocking the individual path from being used for a data communication with one of the data storage volumes; and signaling the blocking of the individual path. A computer program product and a server adapted to implement this method are also disclosed.