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Indirect addressing of channels via logical channel groups

  • US 5,644,712 A
  • Filed: 06/05/1991
  • Issued: 07/01/1997
  • Est. Priority Date: 06/05/1991
  • Status: Expired due to Fees
First Claim
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1. In a computer system in which a plurality of channels electrically couple an active data unit to one or more devices, an IO subsystem for establishing physical paths between the active data unit and the devices, the subsystem comprising:

  • (1) multiple channel path identifiers for identifying the channels;

    (2) one or more logical channel groups comprising lists, stored in a memory unit, comprising varying numbers of said channel path identifiers, the respective lengths of said lists being limited only by the storage capacity of said memory unit; and

    (3) one or more subchannels each exclusively assigned to one of said devices, each of said subchannels maintaining one or more pointers, each of said pointers addressing one of said logical channel groups.

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