IXC418I
SYSTEM sysname IS NOW ACTIVE IN SYSPLEX sysplex-name

Explanation

The indicated system has joined the sysplex.

In the message text:
sysname
The name of the system that is now active in the sysplex.
sysplex-name
The name of the sysplex that this system has joined.

Source

Cross System Coupling Facility (SCXCF)

Module

IXCI2PH3

Routing code

1, 2

Descriptor code

4,12