OSI/AS Configuration and Management Manual

Installing and Configuring the Subsystem
OSI/AS Configuration and Management Manual—424119-001
4-41
Single TSP Process Supporting Multiple X25AM
Lines
The following subsections contain a discussion of the advantages and limitations of this
type of configuration and an example command file.
Advantages
The most obvious advantage is that this is a simple configuration. The operation and
management of one TSP process is straightforward.
Limitations
This type of configuration has the following limitations:
Fault tolerance A single TSP process can also be the single point of failure.
Any problem with this one process, or with the CPU in
which it runs, affects the whole application. Although
NonStop processing requires two separate processes in two
separate CPUs, when the backup CPU and backup process
take over the connections are lost and an interruption of the
communication occurs.
Load distribution There is no way to balance the load in the Transport Layer.
The single TSP process may become a bottleneck for the
application.
Resources A single TSP has limited resources. The buffer pool space of
one TSP process is limited to about 2 megabytes. This may
not be sufficient to support a large number of requesters. In
addition, the maximum number of connections is a limiting
factor when using a single TSP process.
Startup time The startup time may be longer if a large number of
subdevices need to be added before any connection is
established.