Electrical computers and digital processing systems: memory – Storage accessing and control – Control technique
Reexamination Certificate
2006-10-19
2009-10-13
Elmore, Stephen C (Department: 2185)
Electrical computers and digital processing systems: memory
Storage accessing and control
Control technique
C711S156000, C711S202000, C711S206000
Reexamination Certificate
active
07603530
ABSTRACT:
Methods and structures for dynamic multiple indirections to improve reliability and performance of a dynamically mapped storage devices. In a dynamically mapped storage device in which all user supplied logical blocks are dynamically mapped by the storage device controller to physical disk blocks, features and aspects hereof provide for dynamically altering the number of replicated copies (multiple mapped indirections) of user data stored on the storage device. Performance information regarding operation of the storage device may be gathered by the storage device controller such that where physical capacity of the storage device permits and as degrading reliability is detected, additional copies (multiple indirections) of stored user data may be written to the mapped storage device. Increased multiple indirections improves reliability by decreasing the probability of data loss in response to various failure modes of the storage device. Strategic physical placement of the multiple copies (multiple indirections) may improve performance by reducing latencies associated with accessing the user data.
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Liikanen Bruce A.
Mallary Mike L.
Vogan Andrew W.
Elmore Stephen C
Lucente David K.
Seagate Technology LLC
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