z/OS HCD User's Guide
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Generating a switch matrix

z/OS HCD User's Guide
SC34-2669-00

Generating a switch matrix

When selecting Generate Matrix, HCD will define the content of the switch matrix according to the logical paths defined and the existing matrix will be replaced.

This is useful, if channel path - control unit connections have been added or changed and you want to define a switch configuration which considers all defined logical paths running through the selected switch.

To generate a matrix, perform the following steps:

  1. On the Switch List select the switch and select the Work with switch configuration action from the context menu (or action code  s ). HCD displays the Switch Configuration List.
  2. On the Switch Configuration List select a configuration (or action code  g ). HCD will issue an informational message requiring you to confirm your action. The successful generation of the matrix is confirmed by HCD.

When generating the switch configuration, all defined logical paths will be analyzed by HCD. In the case of chained connections, all possible paths of chaining switches will be determined by their respective switch configurations. Therefore, it is necessary, that you select a switch configuration for each chained switch, for which more than one switch matrix has been defined. In this case, the following panel

                    Select Active Switch Configurations              Row 1 of 2
 Command ===> ___________________________________________ Scroll ===> PAGE

 For each switch select one to be used as context to generate a switch
 matrix.


 Switch ID: 01 Configuration ID: SC1

 / Switch  Configuration Description
 _ 02      SC1
 _ 02      SC2
 ******************************* Bottom of data *************************

will be displayed allowing selection of the related switch configurations which are considered for the Generate matrix action.

The following rules are applied when generating a matrix:

  • The default connection for the switch configuration will be set to prohibited.
  • A logical definition between a channel path using the switch as a dynamic switch and a control unit will lead to a dynamically allowed connection between the channel path entry port and the port serving as the link address.
  • A logical definition between a channel path without a dynamic switch and a control unit, or connections via a chaining switch, will lead to a dedicated connection.

    HCD will define a dedicated connection in all the cases where there is only one connection possibility left between the control unit and the channel path entry port. For dedicated connections, HCD considers only those ports, which have not yet been used for dynamic connections. In the case of chained connections, the selected switch configurations of chaining switches are used to determine the possible paths.

  • Connections between ports connected to a channel path type, which make a specific port configuration necessary, will be set accordingly. For example, connections between ports serving as entry ports for FCV channels will be defined as explicitly dynamically prohibited.
  • In addition to generating the matrix, HCD issues informational messages for all cases in which a path was not completely defined or where different paths conflict with each other. If HCD is not able to determine port connections unambiguously, it will leave those definitions to the user.

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