Chapter 6. Monitor implementation and operation 157
Figure 6-22 CSM storage monitoring
6.5.5 Monitoring network interfaces
The network interfaces are used as paths to communicate with the network. A
single z/OS image can have different types of interfaces, such as OSA express
cards, XCF communication links, and channel attached interfaces, such as Cisco
and IBM routers.
The most used network interfaces are the OSA adapters. OSA adapters have
two different configurations: the QDIO mode and the non-QDIO mode or LCS
adapters. To learn more about OSA adapters, refer to the following publications:
OSA-Express Customer’s Guide and Reference, SA22-7935 and SA22-7476
OSA-Express Implementation Guide, SG24-5948
OSA-2 Implementation Guide (Update), SG24-4770
The network interfaces have to be monitored to prevent network congestion and
to ensure that the network definitions are being followed. One of the ways to
verify the network routes and load balancing options is by checking the traffic
flow for inbound and outbound directions.
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To learn more about network interfaces, look at the following documentation:
Communication Server for z/OS V1R2 TCP/IP Implementation Guide Volume
4: Connectivity and Routing, SG24-6516
z/OS V1R6 Communications Server: IP Configuration Guide, SC31-8775
z/OS V1R6 Communications Server: IP Configuration Reference, SC31-8776
The status page shows the interfaces on all systems. Figure 6-23 shows the
interface’s capabilities. There is a filter applied to this page that selects only the
interfaces that have osa on their names.
Figure 6-23 Interface status
In Figure 6-24 on page 159, on the same status page, it is possible, as an
example, to see the maximum MTU supported by the interfaces.
Chapter 6. Monitor implementation and operation 159
Figure 6-24 Interface status (continued)
In Figure 6-25 on page 160, it is possible to monitor the interface statistics, such
as the traffic rate. It is possible to see, for example, if there are two interfaces
connected to the same lan and the TCP/IP profile is set to use multipath;
transmitted octets for both interfaces have to be similar.
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Figure 6-25 Interface unicast performance metrics
For the multicast and broadcast traffic, there is a specific page, Interface
Multicast/Broadcast Performance Metric, which shows information about these
protocols. If the OSPF routing protocol is being used, it will generate some data
for the multicast traffic.