SPEICHERPLATTENTEILSYSTEM

摘要

In a disk array subsystem capable of changing the data redundantizing method between duplexing method and parity method, it is an object of the present invention to reduce the load of data transfer occurring at the time of changing the redundantization method. In the disk array subsystem according to the present invention, since one data of the duplexed data are used for data for the parity data area, the one data secures an area for storing parity prepared from the data. With the arrangement, it is not necessary to transfer the data when the data redundantizing method is changed from duplexing to parity method. It is also possible to mitigate the data transfer load when the redundantizing method is changed from parity to duplexing.