On PR/SM - Physical configuration of a sysplex on LPARs

Figure 1 shows the physical connections needed to connect two MVS™ systems on two logical partitions (LPARs) in one PR/SM™ processor and provide redundant channels, signaling paths, and couple data sets.

In this configuration, a failure on any one channel, path, ESCD, or couple data set does not bring down the sysplex. In the event of a failure, MVS can use a different channel, path, ESCD, or alternate couple data set to maintain sysplex operation.

The figure shows channel to channel connections through ESCDs.
A channel on each LPAR is connected to the primary couple data set and a second channel is connected to the alternate couple data set; both data sets are shared by the two LPARs.
A Sysplex Timer is not needed in this sysplex because MVS can use the clock of the processor to synchronize timestamps. However, in this sysplex, a Sysplex Timer could be used.
A coupling facility could be used in this configuration.

Figure 1. On PR/SM - Physical Configuration of a Sysplex on LPARs

Note: If you have PR/SM installed with the ESCON® Multiple Image Facility (EMIF), you can share ESCON channels among logical partitions. For information about EMIF and shared channel paths, see PR/SM Planning Guide and z/OS HCD Planning.