Disk drive array with request fragmentation
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United States of America Patent
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May 17, 1994
Grant Date -
N/A
app pub date -
Dec 17, 1991
filing date -
Dec 17, 1991
priority date (Note) -
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status (Latency Note)
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Abstract
A disk controller which fragments host requests into atomic requests or one cycle operations prior to execution. The disk controller is coupled to a disk array and receives requests from a host CPU. Host requests are fragmented down to atomic operations. This is highly advantageous for error handling because the controller is not required to determine which phase of an operation is being requested, since every operation is single phase. The present invention includes use of fence markers or execution-control markers to 'fence' of mark a block of tasks and ensure that the atomic operations are executed in sequence, if necessary. These markers ensure that related sequences of atomic operations are kept together without, for example, possibly disruptive intervening writes.
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