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Dynamically mapped data storage subsystem having multiple open destage cylinders and method of managing that subsystem

  • US 5,581,724 A
  • Filed: 05/12/1995
  • Issued: 12/03/1996
  • Est. Priority Date: 10/19/1992
  • Status: Expired due to Term
First Claim
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1. A data storage subsystem for storing data records for a host processor, which is connected to said data storage subsystem, said data storage subsystem comprising:

  • a plurality of data storage elements, a number of said data storage elements being configured into a plurality of redundancy groups, each redundancy group including n+m of said plurality of data storage elements, where n and m are both positive integers, with n greater than 1 and m greater than 0 and wherein each redundancy group is divided into a plurality of logical cylinders for storing data;

    control unit means comprising;

    at least one multipath storage director means for interconnecting said host processor with said data storage subsystem,cache memory means connected to and interconnecting said at least one multipath storage director means and said redundancy groups;

    processor means for maintaining a plurality of said logical cylinders concurrently open to write data from said cache memory means to a selected one of the plurality of concurrently open logical cylinders, wherein said processor is responsive to receipt of data records from said host processor, for selecting, independent of said host processor, available memory space in one of said plurality of concurrently open logical cylinders to store the received data records; and

    disk drive manager means for writing the received data records and data redundancy information for the received data records from said cache memory means into the selected available memory space.

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