Includes multiple virtual volumes one which or in the multiple virtual volume aggregates manages the information

摘要

PROBLEM TO BE SOLVED: To maintain information in one or more virtual volume aggregates comprising a plurality of virtual volumes.;SOLUTION: A plurality of virtual volumes are maintained in a first information storage medium, and form one or more virtual volume aggregates. Each of the virtual volumes is assigned to one of the virtual volume aggregates. Furthermore, a plurality of second information storage media are provided. Then, the least recently used virtual volume is identified, and the virtual volume aggregate comprising that least recently used virtual volume is written to one or more second information storage media. Thereafter, it is determined if space is required on the first information storage medium. If space is required on the first information storage medium, the virtual volume aggregate comprising the least recently used virtual volume is selected, and each virtual volume in that selected virtual volume aggregate written to one or more second information storage media is removed from the first information storage medium.;COPYRIGHT: (C)2009,JPO&INPIT