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Apparatus and method for communicating a quiesce and unquiesce state between elements of a data processing complex

  • US 5,481,738 A
  • Filed: 06/01/1993
  • Issued: 01/02/1996
  • Est. Priority Date: 02/20/1992
  • Status: Expired due to Term
First Claim
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1. A method of reconfiguring an operational link between a first element interconnected with a second element of a data processing complex, each of said elements containing at least one channel for interfacing with other elements, said method comprising:

  • initiating from a quiesce operator, which has become a master after a quiesce, a desired reconfiguration sequence, which reconfiguration sequence includes the steps of;

    determining operational connectivity between a channel of said first element and a channel of said second element for every conductor interconnecting said elements;

    acquiring a node descriptor on each operational conductor connected to said, said node descriptors uniquely describing a channel to which said conductor is connected;

    sending an operational-transceiver request on an operational conductor connected to an originator channel, said request containing a node descriptor which uniquely describes said originator channel and said originator transceiver;

    receiving said operational-transceiver request on a receiving set of transceivers in a recipient channel; and

    responding to said operational-transceiver request on each of said transceivers in said receiving set with an operational-transceiver response, said response containing a node descriptor which uniquely describes said recipient channel and said receiving transceiver;

    marking as configured in a configured-conductor table, each conductor connected to each of said channels if said acquired node descriptor matches a node descriptor uniquely describing said interconnected channel;

    generating an intended-operational-link, said intended-operational-link being one of a plurality of allowed-operational-links, said allowed-operational-links being sets of conductors which are allowed to form an operational link;

    comparing each conductor in said intended-operational-link to said configured-conductor table;

    repeating said generation and comparison steps if one of said conductors in said intended-operational-link is not marked as configured in said configured-conductor table;

    verifying said intended-operational-link if each of said conductors in said intended-operational-link is marked as configured in said configured-conductor table, said verification ensuring that said intended-operational-link can form an operational link between said channels; and

    establishing said operational link from said intended-operational-link if said intended-operational-link is verified.

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