Importance

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Abstract

The utilization of a level of a data storage hierarchy is monitored and the data in such level is manipulated in response thereto. In a data storage hierarchy including an automated storage library, the utilization is a mount rate relative to the maximum possible mount rate. When the combined utilization of all of the libraries exceeds a predetermined value, data is promoted from the most utilized library (or libraries) to a higher level in the data storage hierarchy until the combined utilization of all of the libraries is sufficiently reduced. By reducing the combined utilization of all of the libraries, the average queue time for library mount requests is prevented from becoming excessively long relative to the average library mount cycle time. When the difference between the utilization of the most utilized library and the least utilized library exceeds a predetermined value, data is passed from the most utilized library (or libraries) to the least utilized library (or libraries) until the difference is sufficiently reduced. By reducing the difference in utilization between the most and least utilized libraries, mount activity is evenly distributed among the libraries.

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First Claim