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Extending system of input/output channel

  • US 5,845,146 A
  • Filed: 09/05/1996
  • Issued: 12/01/1998
  • Est. Priority Date: 09/05/1995
  • Status: Expired due to Fees
First Claim
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1. An information processing system including a central processing unit, a memory device and an input/output channel wherein a plurality of virtual computers act on said central processing unit, comprising:

  • a plurality of input/output processing units included in said input/output channel;

    wherein each virtual computer issues a region ID which identifies said virtual computer and a channel path ID which identifies an input/output channel to be used to access one of said input/output processing units;

    a channel path reconfiguration array having a plurality of channel path reconfiguration array blocks corresponding to region IDs, each channel path reconfiguration array block comprises a plurality of channel path reconfiguration array entries corresponding to channel path IDs, each channel path reconfiguration array entry having an input/output processing unit number and a channel path ID; and

    selecting means for selecting a channel path reconfiguration array block within said channel path reconfiguration array corresponding to said region ID issued by said virtual computer and selecting a channel path reconfiguration array entry corresponding to said channel path ID issued by said virtual computer within the selected channel path reconfiguration array block,wherein said virtual computer selects one of said input/output processing units corresponding to the input/output processing number from the selected channel path reconfiguration array entry and accesses the input/output processing unit using the channel path ID from the selected channel path reconfiguration array entry.

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