Electrical computers and digital processing systems: memory – Storage accessing and control – Specific memory composition
Reexamination Certificate
2005-09-27
2005-09-27
Padmanabhan, Mano (Department: 2188)
Electrical computers and digital processing systems: memory
Storage accessing and control
Specific memory composition
C711S004000
Reexamination Certificate
active
06950900
ABSTRACT:
A method and apparatus that moves data stored in a first (e.g., 512) byte sector format to a second (e.g., 52x) byte sector size. The method and apparatus performs data migration without interruption of the host's ability to write and read data from the system. By migrating data to a number of new drives added to the system drive, the additional data which will be stored may be accommodated. The added drives allow the migration to take place without interruption of the hosts I/O path or allows the data to be migrated to an entirely new set of physical drives. The present invention also provides the ability to migrate data between sector sizes and still protect against component failures. The migration is performed in such a way that if a controller fails while performing the migration the survivor controller will be able to pick up where the failed controller left off. This is done through checkpoints in the migration process and saving information to a non-volatile memory which allows for resumption of the migration process.
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McKean Brian Dennis
Otterness Noel S.
Baker Paul A
Crawford & Maunu PLLC
Padmanabhan Mano
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