Characteristics of a configuration in which the Domain
Name Server cooperates with workload management (WLM) to route client
requests throughout a cell are:

- The domain name server (DNS) is replicated by setting up a secondary
DNS on more than one system in the cell.
- The client must know the host name and port of the name server
to connect to WebSphere® Application
Server for z/OS®.
- Each system in the cell has the same location service daemon
IP name. Workload management and the domain name server determine
the actual system that receives client requests. The client sees the
cell as a single system, though its requests might be balanced across
systems in the cell.
- As part of workload balancing and maximizing performance goals,
workload management also routes work requests to systems in the cell.
This function is possible because WebSphere Application
Server for z/OS cooperates
with workload management. Because the system references that a client
sees are indirect, even requests from that same client might be answered
by differing systems in the cell.
- The implication for clients is that they should not cache IP
addresses unless they can recover from failed connections. That is,
if a connection fails, a client should be able to reissue a request,
but, because the IP address is an indirect address, a reissue of the
request can be answered by another system in the cell.
For additional details on setting up servers for connection optimization,
see z/OS Communications
Server: IP Configuration Reference.