
108 IMS in the Parallel Sysplex Volume II: Planning the IMSplex
And although these IMSs functioned together in a single IMSplex, presenting a single image
to the end-user, they did little to coordinate their definitions or activities. So, while the IMSplex
presented a nice single image to the end-user, this was only true while that user’s IMS
remained available. In the event of an IMS or OS/390 failure, it was difficult, sometimes
impossible, for end-users to switch IMSs and resume their status on another IMS. What was
needed was an infrastructure that provided for better resource management and operations
management.
5.1.1 Components of the ...