Electrical computers and digital processing systems: memory – Address formation – Address mapping
Patent
1996-06-05
1998-06-09
Kim, Matthew M.
Electrical computers and digital processing systems: memory
Address formation
Address mapping
711112, 711160, G06F 1206
Patent
active
057652040
ABSTRACT:
A method and apparatus are provided for adaptive localization of frequently accessed, randomly addressed data in a direct access storage device (DASD) to achieve improved system access performance. At selected sampling intervals, a DASD storage controller analyzes data access patterns based on frequency of access, identifies a remapping algorithm to remap the logical groups to physical groups, and moves the physical groups according to the identified remapping algorithm. The data reordering on the DASD provides frequently accessed data in close proximity so that seek time is minimized. The adaptive data localization method periodically performed by the storage controller is transparent to the host file system. The reordering of the data on the DASD is performed during periods of low system data transfer activity.
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Bakke Brian Eric
Huss Frederic Lawrence
Moertl Daniel Frank
Walk Bruce Marshall
International Business Machines - Corporation
Kim Matthew M.
Pennington Joan
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