Patent ID: 7958324

Claim:
A computer system having a host computer and a plurality of storage controllers used by the host computer, the computer system comprising: a first manager, disposed in the host computer, for associating a first priority with a first command issued from the host computer based on a first management table; and a second manager, disposed in at least any one prescribed storage controller of the plurality of storage controllers, for receiving both a second command issued from the prescribed storage controller and the first command issued from the host computer, the second manager (1) configuring a second priority for the second command based on a second management table, (2) respectively controlling an execution frequency of the first command and an execution frequency of the second command based on the first priority and the second priority, and (3) adjusting at least any one of the first priority and the second priority to make the execution frequency of a prescribed command of either the first command or the second command coincide with a preconfigured target value; wherein the first management table and the second management table respectively comprise a command priority management table in which priority values are respectively associated beforehand with each of the first command and the second command, and a priority invocation ratio management table in which an invocation ratio is associated beforehand with each of the priority values.