Server applications register with the MVS™ Workload Manager (WLM), which quantifies
the availability of server resources within a sysplex. The WLM must be configured
in goal mode on all hosts within the sysplex. TCP/IP stacks can also register
with the WLM to provide information on the started IP addresses, or static
definitions can be used if stacks do not support registration. When registering,
server applications provide the following information:
- Group name
- This is the name of a cluster of equivalent server applications in a
sysplex. It is the name within the sysplex domain that client applications
use to access the server applications. CICS® uses the DNSGROUP parameter of the TCPIPSERVICE
resource definition as the group name to register with the WLM.
- Server name
- This is the name of the server application instance. The server name
must be unique among all servers that share the same group name. A server
application instance can belong to more than one group. CICS registers with
WLM using the specific APPLID of the region as specified by the APPLID system
initialization parameter.
- Host name
- This is the host name of the TCP/IP stack on which the server application
runs. During startup, CICS calls the TCP/IP function gethostbyaddr to determine the host name of the machine on which it is
running, and passes it to the WLM for registration.