On-line reconstruction processing method and on-line reconstruction processing apparatus

摘要

An on-line reconstruction processing method for data storage array apparatus which possesses plural segments formed of divided storage areas in plural data storage units and plural parity groups grouped of the segments in the plural data storage units by a specified algorithm, and stores redundancy data into at least one segment of the plural parity groups, has ;a first step of specifying the parity group which needs to be reconstructed; ;a second step of reading data of the parity group which needs to be reconstructed, from the data storage units; ;a third step of reconstructing the data of the parity group with the data read out by the second step; and ;a fourth step of writing the data reconstructed by the third step into the data storage array apparatus, ;wherein the second step includes a read instruction step of instructing the data storage units corresponding to the parity groups to read data and a data output step at which the data storage units perform data read and output according to the read instructions, ;the fourth step includes a write instruction step of instructing the data storage units corresponding to the parity groups to write the reconstructed data and a data input step at which the data storage units receive and write the reconstructed data according to the write instructions, and ;an external host device performs data access to the data storage array apparatus between beginning of the read instruction step and end of the data input step.