To activate ECS, perform the following steps:

1. Define the ECS structure in the CFRM policy and activate the policy. This action should connect all ECS-eligible systems to the ECS structure.
2. Specify the ECSHARING attribute for the desired catalogs so that they are ECS-eligible.
3. Issue the MODIFY CATALOG,ECSHR(AUTOADD) command on one system to enable AutoAdd throughout the sysplex. (AUTOADD can also be enabled at IPL time, see Operational Considerations for details on how to do this.) This will cause all catalogs that are eligible to be automatically activated on their next reference.
   Restriction: Autoadd should never be enabled if all participating systems are not connected because once autoadd is enabled, it will automatically add catalogs to the ECS structure on the next reference on each system. For example, if System A is connected and System B is not connected and autoadd is enabled, catalogs will automatically be added on System A, but not on System B. Therefore, two systems would try to share the same catalog using different sharing protocols (System A uses ECS; System B uses VVDS sharing). Because data integrity would be compromised in this situation, ECS detects and prevents this situation by rejecting System B's catalog requests with RC228 RSN26. If this situation occurs, issue the MODIFY CATALOG, ECSHR(DISCONNECT) command on all connected systems.
4. If a catalog is eligible (has the ECSHARING attribute) but still does not activate automatically and the MODIFY CATALOG, ECSHR(STATUS) command shows a status of Inact(NonECSAcc) because the catalog is currently available for only non-ECS users, then use the MODIFY CATALOG,ECSHR(ENABLE,catname) command to activate the catalog.).