High Availability Monitors Version A.03.02 Release Notes

Introduction to the NOF API

SNAplus2 Resources

Chapter 160

Figure 1-2 PU Concentration Facilities Provided by SNAplus2

The downstream computer must contain an SNA PU type 2.0 or 2.1 to

support dependent LUs.For example, the downstream computer could be

a PC running Microsoft's SNA Server for Windows NT or another

SNAplus2 computer.

Using this feature, all the data transferred between the host and the

downstream computer is routed through the SNAplus2 local node. This

enables a downstream computer to share a host connection with

SNAplus2 or with other downstream computers instead of requiring a

direct link. For example, you could set up several downstream computers

connected to SNAplus2 over a local Token Ring network, so that they

could all access the same long-distance leased line from SNAplus2 to the

host.

Using PU concentration also simpliﬁes the conﬁguration at the host

because there is no need to deﬁne the downstream computers and the

communications links to them. The host conﬁguration only needs to

include the SNAplus2 computer and its host communications link; the

LUs at the downstream computers are conﬁgured as part of the

resources of the SNAplus2 computer. The host computer is not aware

that PU concentration is being used.