IBM Tivoli Monitoring for Network Performance V2.1 The Mainframe Network Management Solution

Chapter 6. Monitor implementation and operation 147

Figure 6-13 UDP endpoint throughput and traffic

For the IP protocol, the IBM Tivoli Monitoring for Network Performance has only

one panel, which contains information about the manipulated datagrams for each

one of the systems being monitored. Figure 6-14 on page 148 shows an example

of this situation.

148 IBM Tivoli Monitoring for Network Performance V2.1: The Mainframe Network Management Solution

Figure 6-14 IP stack throughput and traffic

Monitoring applications

Most of the applications running on a z/OS system support the TCP/IP protocol

on some level. Each one has its own application specific protocol built under the

TCP/IP protocol. For example, for terminal emulation, we have the UNIX Telnet

protocol and the TN3270 protocol. For file transfer, we have the FTP protocol,

and for Web applications, we have the HTTP protocol. Those are well-known

TCP/IP application protocols, but there are many others.

Each one of these protocols is identified by the TCP/IP stack by ports. Each port

will be listening, or accepting connections, to a specific application protocol, so

there will be a specific address space listening on a specific port.

It is possible to have the same address space listening on more than one port at

the same time, like the HTTP Server for normal and SSL connections. The

TN3270 server can have 256 different ports at the same time for normal and SSL

connections.

The IBM Tivoli Monitoring for Network Performance cannot understand what is

happening within the application protocol, but it can monitor the application

Chapter 6. Monitor implementation and operation 149

behavior in terms of the number of active connections, the number of

connections accepted, bytes sent and received, and so on.

For the TN3270 and FTP applications there are a special set of pages show

specific information for those two application protocols.

For the FTP applications, there are three different pages:

򐂰 The active FTP sessions page shows, on a specific time, all server and client

sessions from the z/OS images. As an example, see Figure 6-15.

Figure 6-15 FTP sessions

򐂰 The z/OS FTP client transfer records page shows only the information about

client sessions started from a z/OS system to a remote FTP server.

򐂰 The z/OS FTP server transfer records page show remote clients connections

to a z/OS local FTP server. This page shows complete information about file

transmissions that occurred on a specific period and can be used, for

example, to monitor the activity of specific users. See Figure 6-16 on

page 150.

150 IBM Tivoli Monitoring for Network Performance V2.1: The Mainframe Network Management Solution

Figure 6-16 FTP server transfer records

The TN3270 application is one of the most popular TCP applications running on

z/OS systems. There are three pages showing the TN3270 information:

򐂰 The TN3270 server session availability page shows all TN3270 remote clients

connected to a TN3270 server running on a z/OS image. Each one of the

records will show a complete TN2370 session. As an example, it will show the

start time, end time, local and remote IP addresses and ports, and the

number of transmitted bytes in a specific TN3270 session.

򐂰 The TN3270 sliding-window average response time page shows the

response time for the IP and SNA portions of a TN3270 session. This will only

work on z/S V1.5 systems or later when selecting the option to collect the

TN3270 performance data on monitor definition.

򐂰 The TN3270 response time counts by time bucket page shows the number of

times a response times fits in each response time interval (the buckets). This

only works on z/OS V1.5 systems or later when selecting the option to collect

the TN3270 performance data on monitor definition.