Patent ID: 8612697

Claim:
A method for managing data in a data storage library having first and second types of data storage that have different qualities of service, that have different prices per unit of data storage, and that are reserved for use by the data storage library, the first type of data storage having a higher quality of service and a higher price per unit of data storage than the second type of data storage, the data storage library being configured to exchange data with at least one external computer, the method comprising: storing data files from the external computer to the first type of data storage; upon occurrence of a data storage condition on the first type of data storage, identifying a subset of the data files on the first type of data storage; and storing at least the subset of data files from the first type of data storage to the second type of data storage; and freeing up storage space associated with the subset of files on the first type of data storage; wherein the data storage condition being that a storage capacity of the first type of data storage has been exceeded, where identifying the subset of the data files on the first type of data storage comprises creating a table identifying candidate data files on the first type of data storage to be transferred to the second type of data storage, and where storing at least the subset of data files includes storing, to the second type of data storage, data files on the table that are least recently used by the external computer.