HP-UX SNAplus2 General Information (October 1998)

Chapter 3 53

SNAplus2 Networking Solutions

Adding a Second Server

The local branch achieves scalable load balancing by deﬁning LUs on

both servers and assigning all of those LUs to one LU pool. The

applications on the clients are conﬁgured to use an LU from that pool. If

no LUs are available on one server, the client automatically uses an LU

that is available on the second server.

As more clients are added to the ever-expanding network and the

network trafﬁc continues to increase, the bank can add more SNAplus2

servers, all with LUs that are assigned to the existing LU pool. This

conﬁguration enables client applications to start using these new LUs

without any additional conﬁguration. In this way, the processing power

within the network can be expanded as required, without the need for

network downtime or the need to reconﬁgure clients.

This conﬁguration also provides hot backup capability in the network, by

using multiple servers in the client/server conﬁguration. If a

communication link fails between one of the servers and the host, the

restarted application can automatically use an LU from the pool; the LU

can reside on any of the remaining connected servers.