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公开(公告)号：JPH09282104A
公开(公告)日：1997-10-31
申请号：JP34532396
申请日：1996-12-25
Applicant: SYMBIOS LOGIC INC
Abstract: PROBLEM TO BE SOLVED: To provide a method for improving the performance of a data processing system and the device. SOLUTION: The data processing system 100 is provided with plural storage devices and a backup storage device 106 and the backup storage device 106 is environmentally set as a log (log: recording) device. Data are logged (recorded) in the backup storage device 106 after the backup storage device 106 is environmentally set as the log device. When a fault is generated in one of the plural storage devices, the backup storage device 106 is environmentally set again corresponding to it and used instead of the storage device in which the fault is generated.
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公开(公告)号：JPH08235754A
公开(公告)日：1996-09-13
申请号：JP32869895
申请日：1995-12-18
Applicant: SYMBIOS LOGIC INC
Inventor： JIYON DABURIYUU SUCHIYUWAATO , DENISU II GEITSU , RODONII EI DEKONINGU , KAATEISU DABURIYUU RINKU
Abstract: PROBLEM TO BE SOLVED: To improve the operating performance of a disk drive by providing an independent parity auxiliary engine and a local memory to an RA ID storage system so as to omit access to the disk drive required for parity calculation. SOLUTION: During disk write operation, data blocks received through a host SCSI channel 14 are stored in a local memory 136. A parity auxiliary engine 132 reads the data, calculates parity information and stores the result again to the local memory 136. Then a final data block is written to an adequate disk drive from the local memory 136. The local memory 136 consists of a DRAM or the like and is provided with a 72-bit interface to obtain economically a high frequency band. The parity auxiliary engine 132 uses a 128-byte FIFO to calculate the parity of the data in the local memory 136 in the unit of 1 burst at a time.
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