Autoadd adds ECS-eligible catalogs to the ECS structure on the next reference to the catalog. When CAS connects to the ECS structure, it checks to see if autoadd is already enabled for the sysplex. If so, CAS checks to see if autoadd is enabled for this system as well. If autoadd is not enabled, ECS will not automatically enable it. You can activate autoadd automatically during IPL by turning on the autoadd indicator in the SYSCATxx member of SYS1.NUCLEUS by specifying the value y in column 63, as described in Identifying the Master Catalog and Initial Configuration (SYSCATxx). Or, an operator can manually activate autoadd if there are no ECS-ineligible systems that will be blocked from catalog access by the activation of the ECS autoadd function. Autoadd remains active until one of the following events occur:

• ECS activity is quiesced in the sysplex. (ECS activity is quiesced during a rebuild but reactivates autoadd at the completion of the rebuild unless a rebuild error occurs.) See Quiecsing ECS Activity.
• All systems in the sysplex are down at the same time, such as during a power outage.
• Only one system is ECS-active and a CAS restart or an IPL is performed.