VTAM persistent sessions

This section describes how CICS® handles VTAM® persistent session support. It uses VTAM 3.4.1 persistent LU-LU session improvements to provide restart-in-place of a failed CICS without the need for network flows to re-bind CICS sessions.

Persistent sessions can either be Single Node Persistent Sessions (SNPS) or Multi Node Persistent Sessions (MNPS) depending on how your VTAM network is set up.

If CICS is to support MNPS then PSTYPE=MNPS must be specified in the SIT.

The following mainly describes SNPS. Sections are added where MNPS differs from SNPS.

For an overview of persistent sessions, and a comparison with XRF, see the CICS Transaction Server for z/OS® Release Guide.

For an introduction to this topic from the VTAM point of view, see the Advanced Communications Function for VTAM Programming manual, SC31-6348.

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