z/OS Communications Server: SNA Network Implementation Guide
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Migrating from user-replaceable constants

z/OS Communications Server: SNA Network Implementation Guide
SC27-3672-01

User-replaceable constants were formerly used to control various VTAM® functions, such as:
  • Buffer use storage management services (SMS) trace “snapshot” value
  • Maximum RU size for sessions
  • BSC 3270 timeout (inoperative) value
  • Virtual-route-selection subtask interval analysis block
  • Host intermediate routing node (IRN) slowdown storage
  • NetView® trace data buffers
  • Directory size of the symbol resolution table for the network

User-replaceable constants are now set only as start options. For additional information, see z/OS Communications Server: SNA Customization. For more information about start options, see the z/OS Communications Server: SNA Resource Definition Reference. Start options can be displayed with the DISPLAY VTAMOPTS command, and many of them can be changed with the MODIFY VTAMOPTS command. For more information about the DISPLAY VTAMOPTS and MODIFY VTAMOPTS commands, see z/OS Communications Server: SNA Operation.

Parent topic: Tuning tools

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