Storage apparatus system for reallocating data records among par

Details Storage apparatus system for reallocating data records among par Storage apparatus system for reallocating data records among par

1995-08-07

1998-03-31

Shin, Christopher B.

395618, 395622, 395839, 395441, 395488, G06F 1200, G06F 1300

Patent

active

057348138

ABSTRACT:
In this invention a logical record represents a record accessed by a HOST computer. A physical record represents a record defined on disk units. Physical records consist of data records and parity records. A data record has a value of a logical record. m data records and n parity records form parity records. Parity records are utilized to recover the contents of the data records which belong to the same parity group. A reduction in the generation times of updated values of parity records is realized. A data value of parity records has an allocated status to a logical record and an unallocated status. When a parity-generation scheduling unit decides generation of updated values of a parity group, it recognizes data records which are unallocated to logical records in the parity groups. Then it searches the logical records which are allocated to data records included in the other parity group. Finally it reallocates the recognized data records to the searched logical records. By reallocating data records to logical records, it becomes possible to reduce the number of the parity groups having data records allocated to logical records with updated values.

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