Automatic RECON loss notification overview

SCI is the only CSL manager required for automatic RECON loss notification. If you are using the CSL solely for the automatic RECON lost notification, OM and RM are not required. However, SCI must be available on each z/OS® image. If the IMS control region is started using the DFSCGxxx or the CSL section of the DFSDFxxx member, OM (and possibly RM) is required.

All DBRC instances using a given RECON must join the same IMSplex. You can have your IMS systems configured so that two or more IMS sharing groups are using a single RECON. This configuration is supported if the sharing groups are part of the same IMSplex. However, if each sharing group is identified as a unique IMSplex, then the RECON must be split into multiple RECONs, one per IMSplex. In addition, if the control region and DBRC address spaces both use SCI, they must also join the same IMSplex. You can also have your IMS systems configured so that two or more IMS sharing groups are part of the same IMSplex, but use unique RECONs.

Recommendation: Each RECON in the same IMSplex should have a unique DBRC sharing group ID. This is required if parallel RECON access is enabled for more than one RECON in the IMSplex.

Related reading: For detailed information about automatic RECON loss notification configuration, see IMS Version 15 Database Administration.