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US 7,461,217 B2Granted
Arrangement and method for update of configuration cache data
AssigneeInternational Business Machines Corporation
InventorsDavid John Carr, Michael John Jones, Andrew Key, Robert Bruce Nicholson, William James Scales, Barry Douglas Whyte
Life of this patent
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Abstract
An arrangement and method for update of configuration cache data in a disk storage subsystem in which a cache memory (110) is updated using two-phase (220, 250) commit technique. This provides the advantage that known changes to the subsystem do not require an invalidate/rebuild style operation on the cache. This is especially important where a change will invalidate the entire cache.
Claims8
A method for updating of cache data in a storage system, the method comprising:
- providing a memory holding data;
- providing a cache, separate from the memory, holding data associated with the memory;
- receiving a configuration change transaction;
- in response to the received configuration change transaction, constructing a request for change for updating the cache;
- submitting the request for change to the memory;
- receiving a signal from the memory representative of completion of the request for change;
- updating the cache with the change data and with an updated version number in response to the signal indicating successful completion of the request for change;
- and
- responsive to a user request for a view of a logical resource stored in the memory, comparing a number of the user request to the updated version number and if they are the same producing a response from the cache, and if they are not the same producing a response from the memory.
6 more elements
Dependencies are inferred from the claim text.