Electrical computers and digital processing systems: memory – Storage accessing and control – Control technique
Reexamination Certificate
2004-09-17
2011-11-22
Song, Jasmine (Department: 2189)
Electrical computers and digital processing systems: memory
Storage accessing and control
Control technique
C711S100000, C711S103000, C714S054000
Reexamination Certificate
active
08065492
ABSTRACT:
Various embodiments are disclosed of a failure detection system for a solid-state data storage system that can experience difficulties, such as system failure or loss of data integrity, when it runs out of spare storage locations. Spare storage locations can be used by a solid-state data storage system to replace storage locations that have become defective. In one embodiment, a count is kept of the available spare storage locations in a system, or sub-system, and when the amount of available spare locations drops to a threshold value, an action can be taken to avoid the consequences of an impending failure. In other embodiments, the available spare storage locations are monitored by keeping track of the percentage of initially available spare locations still remaining, by keeping track of the rate of new spare locations being used, or by other techniques. In various embodiments, the early failure detection system responds to detection of a possible impending failure by taking one or more of a variety of actions, including, for example, sending an alert notification, enabling additional storage capacity, copying portions of the data stored in the system to other secure storage locations, shutting the system down, and taking no action.
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McDermott Will & Emery LLP
Song Jasmine
STEC Inc.
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