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Measures reported by CpsConnectionTest
This test not only reports the connection load on the equalizer in numbers, but also points to the nature of the workload by revealing the type of connections handled by the equalizer - this way, administrators can evaluate the workload of the device better. In addition, the test also turns the spotlight on inactive/idle connections, so that administrators can make sure that such connections are kept at a bare minimum.
The measures
made by this test are as
follows:
| Measurement |
Description |
Measurement
Unit |
Interpretation |
| L4Total_connections |
Indicates the number of L4 connections currently processed by the equalizer.
|
Number |
This serves as a good indicator of the Level-4 connection load on the equalizer.
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.
|
| L4Peak_connections |
Indicates the high watermark of L4 connections processed by the equalizer.
|
Number |
|
| L4Idle_timeout_count |
Indicates the number of L4 connections that timed out currently, because they were unused for a long time.
|
Number |
Ideally, the value of this measure should be 0. A sudden/steady increase in this value could be a cause for concern.
|
| L7Active_connections |
Indicates the number of L7 connections currently active on the equalizer.
|
Number |
Both these measures serve as effective pointers to the L7 connection workload on the equalizer.
Layer-7 load balancing, also known as application-level load balancing, is to parse requests in application layer and distribute requests to servers based on different types of request contents, so that it can provide quality of service requirements for different types of contents and improve overall cluster performance. The overhead of parsing requests in application layer is high, thus its scalability is limited, compared to layer-4 load balancing. This is turn implies that a very high value for this measure will be accompanied by a significant increase in the processing overheads, but will ensure improved cluster performance.
|
| L7Total_connections |
Indicates the total number of L7 connections to the equalizer.
|
Number |
| L7Peak_connections |
Indicates the high watermark of L7 connections to the equalizer.
|
Number |
|
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