Changing the RECON data set mode from single to dual

IMS normally works with two active RECON data sets. If one RECON data set becomes unavailable, a spare will be activated if a spare is available.

Recommendations: Stop all IMS subsystems and batch jobs accessing the RECON data sets.

For both online and batch, use dynamic allocation for RECON data sets, and run with at least three RECON data sets.

Procedure

  1. Define a spare RECON data set.
  2. Issue the CHANGE.RECON DUAL command.
  3. Define a new spare data set.
  4. Continue normal processing.