Using MNPS or USERVAR in XRF complexes
You can use IMS multinode persistent sessions (MNPS) support for XRF. Due to performance limitations, this is not a recommended solution.
You can implement one of two types of XRF complexes:
- An XRF complex that uses VTAM® MNPS with an MNPS ACB.
- An XRF complex that uses a user variable (USERVAR) with USERVAR tables.
Both types of XRF complex provide the same increased availability
for IMS, but differ in how they
manage terminal sessions and the takeover process. Other differences
include:
- XRF complexes that use a USERVAR have additional hardware requirements.
- VTAM and the network terminals
use different names to communicate with IMS in
each type of complex:
- In an XRF complex that uses an MNPS, IMS is known to VTAM and the network terminals by the name of the MNPS ACB (the MNPS name).
- In an XRF complex that uses a USERVAR, IMS is known to VTAM by the name of the APPLID ACB (the APPLID name) and to the network terminals by the USERVAR.
XRF complexes that use MNPS still have an APPLID ACB, but it is not used for the purposes of XRF.