| 摘要 |
PROBLEM TO BE SOLVED: To prevent reduction of access performance of a distributed memory system by accessing via cross-over ownership to track mapping information formed as a hierarchical memory.SOLUTION: In assignment of a real storage area to a virtual volume, at first, a page is assigned from a pool, and thereafter, a track is assigned from the page. The page is composed of a plurality of tracks into which track data assigned at host write operation timing are stored sequentially from a top. Mapping information between the virtual volume and the page is stored in a control information page that differs from the track data, and the mapping information is stored in the control information page which could only be accessed by a microprocessor having an ownership of the virtual volume. |
