Background movement of data between nodes in a storage cluster

Details Background movement of data between nodes in a storage cluster Background movement of data between nodes in a storage cluster

2011-08-30

2011-08-30

Ali, Mohammad (Department: 2158)

Data processing: database and file management or data structures

File or database maintenance

C707S802000

Reexamination Certificate

active

08010485

ABSTRACT:
A method, system, apparatus, and computer-readable medium are described for the background movement of data between nodes in a storage cluster. According to one method, exception tables are generated that include data identifying the areas on each node that need to be migrated to another node and the areas on each node that are to be migrated from another node. The exception tables may be generated in response to the failure of a node in the storage cluster or in other circumstances. A background resynchronization thread utilizes the contents of the exception tables to migrate data between the nodes of the cluster, thereby synchronizing the data stored on the nodes. Input/output operations directed to an area that is to be migrated from another node are redirected to the other node in accordance with a timeout period associated with the input/output operations.

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