Method and apparatus for updating data in mass storage subsystem using emulated shared memory
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United States of America Patent
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Jun 28, 2005
Grant Date -
Oct 23, 2003
app pub date -
Apr 17, 2002
filing date -
Apr 17, 2002
priority date (Note) -
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Abstract
A method and apparatus is disclosed wherein a first structure in a memory of a controller for sharing information is defined and a hidden structure containing control information for sharing information with the first defined structure is created. Data is synchronized between controllers so that firmware development is simplified. The user defines a structure and through the use of macro calls makes that structure shared. Lock rules are provided, to perform synchronization and buffer management. Failover and failback are also addressed to provide a comprehensive solution for sharing work and information between controllers. Accordingly, the emulated shared memory mechanism allows a programmer to define a structure that contains information for sharing without having to reinvent firmware when new features are added to a storage controller.
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