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A sysplex is a way for z/OS and subsystems to "talk" to each other to
coordinate changes and access to resources. For example, RACF is the
security system on the z. I have a single database which contains all
users and all access definations for all systems. Every LPAR can safely
and directly do I/O to that database on DASD because they "talk" via
sysplex communications to "enqueue" access as needed for updating.
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