z/OS MVS Setting Up a Sysplex
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Calculating the size of a list structure for signaling

z/OS MVS Setting Up a Sysplex
SA23-1399-00

To calculate the size of a list structure for signaling, use the formula in PR/SM™ Planning Guide.

A list structure for signaling requires the following attributes:
  • A list-structure-type that uses adjunct and data but neither keys nor names.
  • An entry-to-element ratio of 1
  • A list-element-characteristic value of 4
  • A maximum data-list-entry size value of 16
  • A lock-table-entry characteristic value of 0
  • A lock-table-entry count value of 0
  • The number of list headers required depends on the number of systems using the structure for pathin and/or pathout. Use the following formula to calculate the number of list headers:
    #lists = 8 + #paths
    
          where:
    
             #paths =
                 (#systems using the CF list structure as PATHOUT
                    * #systems using the CF list structure as PATHIN) -
                 #systems using the CF list structure as both
                    PATHOUT and PATHIN
  • List entries are tracked by entries (not by elements). XCF sets list limits on the individual lists in the structure.
  • The structure disposition is DELETE.
  • The connection disposition is DELETE.
  • Structure rebuilds are allowed.
  • Non-volatility is not required.
  • List monitoring is used.

    A list notification vector is allocated on each system to perform this monitoring. You need one vector for each signaling structure on each system in the sysplex that is using the structure. The number of entries in the vector is equal to the number of systems from which the system will receive signals through that signaling structure.

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