z/OS Communications Server: SNA Network Implementation Guide
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Session-level pacing tuning considerations

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

Usage of the following storage areas affects the efficiency of pacing in the network:
  • Input/Output buffer
  • Application program data space
  • Common storage manager

When storage usage hits a constraint level (70 percent usage) or critical level (90 percent usage), VTAM® takes an appropriate action to reduce the storage usage. Constraint and critical levels are in part determined by user specifications and vary for each of the listed storage areas.

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