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Method for reducing disk I/O accesses in a multi-processor clustered type data processing system

  • US 5,239,643 A
  • Filed: 07/19/1991
  • Issued: 08/24/1993
  • Est. Priority Date: 11/30/1987
  • Status: Expired due to Term
First Claim
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1. A method to minimize I/O access operations in a data processing system havingA) a plurality of processor units comprising a first processor unit with a first main memory, first operating systems, and first secondary storage device;

  • a second processor unit with a second main memory and second operating system; and

    a third processor unit with a third main memory and third operating system; and

    B) a switch for selectively interconnecting any pair of said units in a data transferring relationship to permit data that is stored in said first memory to be transferred to said third main memory in response to request from said third unit to said first unit, said method comprising the following steps in combination;

    A) maintaining by each said first, second and third operating system,(a) a list of each of the files stored in said data processing system, and(b) an indication of which of said processor units is the access coordinator for said each of said files,B) opening one of said files, stored at said first processor unit as identified by said indication in response to a request to said first processor unit for specified information from said second said processor unit,C) transferring from said first secondary storage device of said first processor unit to said first main memory and thereafter transferring from said first main memory to said second main memory said specified information from said one of said files in response to said request by said second processor unit, and discarding said specified information from said first main memory, andD) thereafter transferring said specified information from said second main memory to said third main memory in response to a request from said first operating system to said second operating system, that was prompted by a request to said first operating system from said third operating system for said specified information.

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