System for controlling data flow between plurality of host interfaces and drive interfaces using controller for select unoccupied interfaces after preparation of read/write operation is complete
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United States of America Patent
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Feb 11, 1997
Grant Date -
N/A
app pub date -
Nov 8, 1993
filing date -
Nov 11, 1992
priority date (Note) -
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status (Latency Note)
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Abstract
An external storage system is connected to a host system. A controller unit interposed between disk drives and the host system has a large capacity buffer memory with a battery providing non-volatile storage, a plurality of host interfaces and a plurality of drive interfaces. All the accesses made to the disk drives from the host system are realized via the buffer memory which allows a high-speed access. Read/write processing performed for the buffer memory by the host system is executed asynchronously with read/write processing performed between the buffer memory and the disk drives. The drive interface and the host interface area released during a period in which operation of the disk drive is waited for and recoupled upon data transfer.
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