| 摘要 |
PROBLEM TO BE SOLVED: To shorten an IO processing time length in a storage control device for providing storage resources of external storage subsystems as if its own storage resources. SOLUTION: A cache memory 24 has cache areas allocated to respective communication ports 41 of external storage subsystems 40. When data related to an IO command received from a host device 10 is in an external LDEV 42, if the cache area produces no cache hit, an IO command is issued to the external storage subsystem 40 and then an IO processing result is sent to the host device 10. The storage control device (20) issues dummy IO commands to the respective communication ports 41 to measure response times. Larger cache capacities are allocated to communication ports 41 producing larger measured values. Higher cache hit rates are thus possible in cache areas corresponding to communication ports 41 producing larger measured values. COPYRIGHT: (C)2007,JPO&INPIT
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