1. A method for replacing a first root file system comprising: retrieving a second root file system; mounting the second root file system on a first system in a sysplex as the sysplex root file system; replacing sysplex root mount information associated with the first root file system with sysplex root mount information associated with the mounted second root file system; updating a root on the first system to point to the mounted second root file system; invalidating the first root file system on the first system; updating a first file system to point to the mounted second root file system in the first system; updating an active process with the sysplex root mount information associated with the mounted second root file system; and unmounting the first root file system from the first system.