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US 8,275,959 B2Granted
Failover control of dual controllers in a redundant data storage system
AssigneeSeagate Technology LLC
InventorsAyman Mohammad Ghanem, Robert George Bean
Life of this patent
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AssigneeSeagate Technology LLC
InventorsAyman Mohammad Ghanem, Robert George Bean
Estimating the term…
A redundant data storage system is provided comprising a first controller with top-level control of a first memory space and a second controller with top-level control of a second memory space different than the first memory space. The system is adapted for asynchronously reflectively writing state information by the first controller to the second memory space; alternatively the system is adapted for asynchronously reflectively writing state information by the second controller to the first memory space. A method is provided for operating the redundant data storage system by resolving any inconsistency between the existing state information and a modified state information associated with a state information change request, and for switching control in the redundant data storage system between the controllers.
A redundant data storage system comprising a first controller with top-level control of a first memory space and a second controller with top-level control of a second memory space different than the first memory space, the system adapted for writing state information by the first controller to the second memory space making the state information available to the second controller without a delay associated with acknowledging the writing of state information to the second memory space.
A method for operating a redundant data storage system having a first controller and a second controller, the method comprising:
Dependencies are inferred from the claim text.