Storage controller and storage control method

Error detection/correction and fault detection/recovery – Data processing system error or fault handling – Reliability and availability

Reexamination Certificate

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Reexamination Certificate

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07913112

ABSTRACT:
This storage controller includes a port unit and multiple processing units for inputting and outputting data to and from a storage apparatus. The port unit sorts the data I/O requests given from a host system to the corresponding processing units according to a table pre-defining the storage apparatus or a storage area in the storage apparatus to perform data I/O processing allocated to each of the processing units. The processing unit inputs data in the corresponding storage apparatus or the corresponding storage area according to the data I/O request sorted to itself from the port unit and, upon detecting a blockage of the other processing unit due to a failure, updates the table retained in each of the port units so as to sort the storage apparatuses or the storage areas allocated to the other processing unit to the remaining unblocked processing units.

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Search Report in European Application No. 09250035.4—2224, mailed Apr. 6, 2009.
Hughes-Fenchel, G, “A Flexible Clustered Approach to High Availability”, Fault-Tolerant Computing, 1997, FTCS-27. Digest of Papers., Twenty-Seventh Annual International Symposium on Seattle, WA, USA, Jun. 24-27, 1997, Los Alamitos, CA, Jun. 24, 1997, pp. 314-318.

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