The shared memory area calculation for an IMS-enabled enterprise server is essentially the same as for a Web services enterprise server. Your calculation should also include 512 bytes for each 3270 client that is connected to the enterprise server. You must include your message processing regions in the total number of service execution processes.
If you are using CICS or JCL applications in the same enterprise server, in addition to the IMS calculation, perform the calculations described in the Shared Memory Area topics pertaining to CICS and JCL. Add the relevant results to the figure you calculated for IMS.