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Multiple processor system having software for selecting shared cache entries of an associated castout class for transfer to a DASD with one I/O operation

  • US 5,493,668 A
  • Filed: 03/30/1992
  • Issued: 02/20/1996
  • Est. Priority Date: 12/14/1990
  • Status: Expired due to Term
First Claim
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1. A method of controlling data transfer from shared storage to I/O devices in a computer complex, comprising the steps of:

  • structuring a sysplex to include a plurality of central processor complexes (CPCs), in which the CPCs use I/O control software for controlling sysplex direct access storage devices (sysplex DASDs) connected using first data paths to the CPCs for storing data items permanently in the sysplex, and a shared electronic storage (SES) connected using second data paths to the CPCs, wherein said first data paths are separate and distinct from said second data paths, in which the CPCs use SES control software for controlling SES over said second data path,designating by said SES control software castout classes for SES cache directory entries to associate the castout classes with changed data items represented by the directory entries for enabling transfer to DASD in a single I/O operation of a plurality of data items selected from a castout class.

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