Sample sysplex data-sharing configurations

The following figures shows several possible configurations for sysplex data sharing.

The DBRC RECON data set and the IMS database are not shown in these figures but, as in Figure 1, RECON and the database are shared by the IMS systems in the sysplex data-sharing group.

Three structures on one coupling facility

The following configuration shows multiple z/OS® images running in the sysplex data-sharing environment using IRLM. IMS is running on each z/OS image. One coupling facility is being used. The lock, OSAM, and VSAM structures are on the same coupling facility.

Figure 1. Sysplex data-sharing configuration with three structures on one coupling facility
Begin figure description. Three operating systems each have an IRLM and an IMS. The operating systems are connected to a single coupling facility that contains lock, VSAM, and OSAM structures. End figure description.

Three structures on two coupling facilities

The following configuration illustrates multiple z/OS images running in the IMSplex using IRLM. IMS is running on each z/OS image. Two coupling facilities are being used. The lock structure is on coupling facility 1. The OSAM and VSAM structures are on coupling facility 2.

Figure 2. Sysplex data-sharing configuration with three structures on two coupling facilities
Begin figure description. Two operating systems each have an IRLM and an IMS. The operating systems are connected to two coupling facilities. One CF has VSAM and OSAM structures. The other CF has the lock structure. End figure description.

Three structures on one coupling facility with backup

The following configuration shows multiple z/OS images running in the IMSplex using IRLM. IMS is running on each z/OS image. Two coupling facilities are being used. The lock, OSAM, and VSAM structures are on coupling facility 1. Coupling facility 2 is used as a backup so that if coupling facility 1 fails, structures can be rebuilt on coupling facility 2.

Figure 3. Sysplex data-sharing configuration with three structures on one coupling facility with backup
Begin figure description. 3 operating systems are shown as boxes. A coupling facility is shown as a box and connects to the operating systems with arrows. A second coupling facility is used as a backup. End figure description.

Three structures on one coupling facility with backup and XRF

The following configuration shows six z/OS images running in the IMSplex using IRLM. Three active (XRF) IMS systems are running, and each active IMS has an alternate system. The lock, OSAM, and VSAM structures are on the coupling facility.

Figure 4. Sysplex data-sharing configuration with three structures on one coupling facility with backup in an XRF environment
Begin figure description. 6 operating systems (in an XRF) are shown as boxes. A coupling facility is shown as a box and connects to the operating systems with arrows. End figure description.

One structure on one coupling facility

The following configuration shows multiple z/OS images running in a data-sharing IMSplex using IRLM. IMS is running on each z/OS image. One coupling facility is being used. The lock structure is on the coupling facility. No OSAM or VSAM structures are on the coupling facility. This configuration results in a data-sharing IMSplex using the notify protocol for buffer invalidation.

Figure 5. One structure on one coupling facility resulting in sysplex data sharing
Begin figure description. 3 operating systems, each with IMS and IRLM, are shown as boxes. A coupling facility with a lock structure (and no VSAM or OSAM) is shown as a box and connects to the operating systems with arrows. End figure description.