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Measures reported by CpsLBClsStL4Test
Level-4 load balancing is to distribute requests to the servers at transport layer, such as TCP, UDP and SCTP transport protocol. The load balancer distributes network connections from clients who know a single IP address for a service, to a set of servers that actually perform the work. Since connection must be established between client and server in connection-oriented transport before sending the request content, the load balancer usually selects a server without looking at the content of the request.
This test monitors the connections, data traffic, compressed data traffic and compressed HTTP responses for each L4 cluster. Using the metrics of this test, administrators can promptly detect load imbalances and quickly resolve the issue before any serious discrepancies occur.
The measures made by this test are as follows:
| Measurement |
Description |
Measurement Unit |
Interpretation |
| Cluster_L4_total_conns |
Indicates the total number of connections to this L4 cluster. |
Number |
If a sudden/consistent increase in the value of this measure is noticed, you might have to investigate further to identify the reason for this occurrence. |
| Cluster_L4_active_conns |
Indicates the number of connections that are currently active on this L4 cluster. |
Number |
This measure indicates the connection load on the server. By observing the graph of this measure over time, you can analyze the rate of growth of the load on the server. By comparing the value of this measure across all the clusters, you can instantly identify overloaded clusters; this in turn brings irregularities in load balancing to light. |
| Cluster_L4_conn_usage |
Indicates the percentage of connections that were used by this L4 cluster. |
Percent |
A high value is desired for this measure. |
| Cluster_L4_total_trans |
Indicates the total number of transactions performed by this L4 cluster. |
Number |
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| Cluster_L4_receive |
Indicates the amount of data received by this L4 cluster. |
KB |
Comparing the values of these measures across the clusters will help you identify the cluster that is the busiest in the Coyote Load Balancer. This in turn, helps the administrators to identify load balancing irregularities, if any. |
| Cluster_L4_send |
Indicates the amount of data transmitted from this L4 cluster. |
KB |
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