| 摘要 |
PROBLEM TO BE SOLVED: To guarantee a transfer rate of each stream even when the plurality of streams are mixed. SOLUTION: A disk array device required with multistream processing from a host computer performs transfer rate recognition processing for recognizing the transfer rate, drive performance and fault processing time recognition processing, size determination processing of a sequential buffer storing each stream, and drive I/O size determination processing, finds completion requirement time when preread or destage processing has to be completed by use of the buffer size and the transfer rate determined in each process, and determines priority order of I/O on the basis of the time. COPYRIGHT: (C)2007,JPO&INPIT
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