eG Monitoring
 

Measures reported by A10ServiceGroupTest

In a typical client - server scenario, a client request is directed to the destination IP address specified in the header of the request. For sites with huge volumes of traffic, the destination server may be quickly overloaded, Therefore, it is imperative to create a load balancing pool which is in other words called a service group in an A10 Application Delivery Controller. A service group is a logical set of real servers, such as web servers, that you group together to receive and process traffic. Instead of sending client traffic to the destination IP address specified in the client request, the Virtual server of the A10 Application Delivery Controller sends the request to any of the servers that are members of that service group. This helps to efficiently distribute the load on your server resources. In order to efficiently distribute the load across the servers, it is essential to constantly monitor the health and request processing capability of the service groups. This is where the A10ServiceGroupTest test helps.

For each service group configured on the A10 Application Delivery Controller, this test monitors the current health and reveals the request processing ability of the service groups. Using this test, administrator can figure out the service group that is handling the maximum requests and also identify the exact cause on why a service group is slow in processing the requests.

The measures made by this test are as follows:

Measurement Description Measurement Unit Interpretation
Health_status Indicates the current health of this service group.   The values of this measure and their corresponding numeric values are listed below:

Measure Value Numeric Value
Disabled 0
Up 1
Down 2

Note:

By default, this measure reports one of the Measure Values listed in the table above to indicate the health of the service group. In the graph of this measure however, the service group status will be represented using the numeric equivalents.
Data_transmitted Indicates the rate at which data was transmitted from this service group during the last measurement period. MB/Sec Compare the value of these measures across the service groups to identify the service group that is experiencing the maximum load.
Data_received Indicates the rate at which data was received by this service group during the last measurement period. MB/Sec
Packets_transmitted Indicates the rate at which the packets were transmitted from this service group during the last measurement period. Packets/Sec Compare the value of these measures across the service groups to identify the service group that is experiencing the maximum load.
Packets_received Indicates the rate at which packets were received by this service group during the last measurement period. Packets/Sec
Curr_connections Indicates the number of connections that are currently active on this service group. Number This measure is a good indicator of the load on the service group.
Tot_connections Indicates the total number of connections established on this service group since the start of the A10 Application Delivery Controller. Number  
Connection_rate Indicates the rate at which the connections were established on this service group during the last measurement period. Conns/Sec A sudden increase in the value of this measure indicates an increase in the load on the service group.
Conn_usage Indicates the usage percentage of active connections on this service group. Percent A value close to 100% indicates that this service group is currently overloaded.
Persistent_conns Indicates the number of connections that were persistent on this service group. Number TCP connections that are kept open after transactions complete are called persistent connections. Persistent connections stay open across transactions, until either the client or the server decides to close them. These connections when reused can significantly reduce the overload on the new connections to the service group.
Peak_conns Indicates the maximum number of connections that were established on this service group since the start of the A10 Application Delivery Controller. Number  
Curr_L7_requests Indicates the number of L7 requests currently processed in this service group. Number Both these measures serve as effective pointers to the L7 requests processing in the A10 Application Delivery Controller.

Layer-7 load balancing, also known as application-level load balancing, is to parse L7 requests in application layer and distribute L7 requests to the servers based on different types of request content, so that it can provide quality of service requirements for different types of content and improve overall performance of the A10 Application Delivery Controller.
Tot_L7_requests Indicates the total number of L7 requests processed by this service group during the last measurement period. Requests/Sec
Succ_L7_requests Indicates the number of L7 requests that were processed successfully by this service group. Number Ideally, value of this measure should be high.