Control unit in storage subsystem with improvement of redundant

Details Control unit in storage subsystem with improvement of redundant Control unit in storage subsystem with improvement of redundant

1992-01-29

1997-10-28

Nguyen, Hoa T.

Excavating

39518204, G06F 1100, G06F 1110

Patent

active

056823967

ABSTRACT:
A control unit in a storage subsystem connected to a central processing unit includes: a plurality of storage units for storing a plurality of record groups, each of which includes at least one data record and at least one parity record for recovering the contents of the data record, a cache memory; apparatus for receiving a write request issued by the central processing unit, the write request having write data to be written into one data record in the storage units; apparatus for storing the write data into the cache memory and reporting the completion of the write request to the central processing unit; apparatus for loading data of a data record and values of a parity record, each of the data of the data record and values of a parity record, each of the data of the data record and the values of the parity record being necessary for generation of updated values of a parity record of a record group including the one data record, from the storage units into the cache memory, after the reporting by the receiving apparatus, if any of the data of the data record and the values of the parity record are not stored in the cache memory; apparatus for generating the updated values of the parity record by using the data of the data record and the values of the parity record stored in the cache memory, and for storing the generated updated values of the parity record into the cache memory; and apparatus for writing the generated updated values of the parity record and the write data from the cache memory into the storage units, thereby performing a process for generation of an updated value of a parity record attendant upon a write request from a processor with no intervention of a processor.

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ACM SIGMOD Conference Proceedings, Chicago, Illinois, Jun. 1-3, "A Case for Redundant Arrays of Inexpensive Disks (RAID)", David A. Patterson et al.

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