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Cache/disk system with writeback regulation relative to use of cache memory

  • US 4,523,206 A
  • Filed: 03/03/1982
  • Issued: 06/11/1985
  • Est. Priority Date: 03/03/1982
  • Status: Expired due to Term
First Claim
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1. In a cache/disk system having a host processor for issuing read and write commands, a plurality of disk drive devices, a cache memory for storing segments of data most likely to be used in executing commands from said host processor, storage means for storing in a queue commands issued by said host processor but not yet executed, each of said commands including a priority value for determining the relative priorities of execution of said queued commands and a storage control unit for controlling the transfer of segments of data between said cache memory and said disk drive devices, said storage control unit having means for generating a command for controlling the transfer of a written-to segment from said cache memory of one of said disk drive devices, the improvement comprising:

  • first means for generating a written-to priority value in accordance with the percentage of the total number of segments in said cache memory that have been written to; and

    ,second means responsive to said first means for inserting said written-to priority value into the command generated for transferring a given written-to segment to one of said disk drive devices.

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