Patent ID: 6032263
Filing Date: 2000-02-29
Classification: G06F

Abstract:
An array disk storage system connected to a host processor, comprising:a first storage unit having a data record storing data used by the host processor;a second storage unit having a parity record corresponding to said data record of said first storage unit for storing parity data for recovering the data of said data record;a control unit connected to said first and second storage units having a cache memory and receiving update data for said data record specified by a write request from a host processor, said control unit storing said update data into the cache memory, sending said update data in said cache memory to said first storage unit to write said update data into said data record, and then said control unit sending intermediate data generated from said update data and from pre-update data of said data record to said second storage unit; andsaid second storage unit generating updated parity data from said intermediate data and pre-update parity data of the parity record in accordance with an instruction issued by said control unit, and writing the updated parity data into the parity record.