Logical track write scheduling system for a parallel disk drive array data storage subsystem

  • US 5,124,987 A
  • Filed: 04/16/1990
  • Issued: 06/23/1992
  • Est. Priority Date: 04/16/1990
  • Status: Expired due to Term
First Claim
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1. A disk memory system for storing data records for at least one associated data processor comprising:

  • a plurality of disk drives, a subset of said plurality of disk drives being configured into at lest two redundancy groups, each redundancy group consisting of at lest two disk drives;

    means, responsive to the receipt of a stream of data records from said associated data processor, for selecting first available memory space in one of said redundancy groups to store said received stream of data records thereon;

    means for writing said received stream of data records and redundancy data associated with said received stream of data records in said selected first available memory space in said selected redundancy group;

    means, responsive to the subsequent receipt of modifications to one of said data records stored in said first available memory space in said selected redundancy group from said associated data processor, for writing said modified data record, exclusive of the rest of said received stream of data records and said redundancy data associated with said received stream of data records written in said first available memory space, in second available memory space in one of said redundancy groups by including said modified data record with a stream of data records subsequently received by said writing means; and

    means for converting said first available memory space used to store said originally received data record to available memory space.

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