eG Monitoring
 

Measures reported by LtmNodeTest

Nodes are the network devices to which a BIG-IP® local traffic management system passes traffic. You can explicitly create a node, or you can instruct the BIG-IP system to automatically create one when you add a pool member to a load balancing pool. Nodes are the basis for creating a load balancing pool. For any server that you want to be part of a load balancing pool, you must first create a node i.e., designate that server as a node. After designating the server as node, you can add the node to a pool as a pool member. Therefore it becomes essential to check the status of each node and the load through each node in the system so that load balancing is maintained consistently. The LtmNodeTest test exactly does the same.

This test reports the current status of each of the nodes configured on the traffic manager and tracks the data/packet traffic through each node. In addition, this test also reports how well the connections are utilized by the nodes and the active connections on each node.

The measures made by this test are as follows:

Measurement Description Measurement Unit Interpretation
Avail_status Indicates the current status of this node.   The values that this measure can report and its numeric equivalents are mentioned in the table below:

Measure Value Numeric Value
Unknown 0
None 1
Available 2
Currently not available 3
Offline 4
Unlicensed 5

Note:

By default, this measure can report the Measure Values mentioned above while indicating the current status of the node. However, the graph of this measure is indicated using the numeric equivalents 0 - 5 only.
Activity_status Indicates the current activity status of this pool as specified by the user.   This measure appears only if the Avail_status measure reports the Measure Value Available.

The values that this measure can report and its numeric equivalents are mentioned in the table below:

Measure Value Numeric Value
None 0
Enabled 1
Disabled 2
Disabled by parent 3

Note:

By default, this measure can report the Measure Values mentioned above while indicating the current activity status of the node. However, the graph of this measure is indicated using the numeric equivalents 0 - 3 only.
Data_transmitted Indicates the rate at which data is transmitted from this node during the last measurement period. MB/Sec Compare the values of these measures across nodes to identify the node that is handling maximum traffic.
Data_received Indicates the rate at which data is received in this node during the last measurement period. MB/Sec
Pkts_transmitted Indicates the rate at which packets were transmitted from this node during the last measurement period. Packets/Sec Compare the values of these measures to identify the node that is experiencing maximum traffic.
Pkts_received Indicates the rate at which packets were received in this node during the last measurement period. Packets/Sec
Active_conns Indicates the number of connections that are currently active on this node. Number  
Total_conns Indicates the total number of connections established on this node since the start of the traffic manager. Number  
Connection_rate Indicates the rate at which connections were established during the last measurement period. Conns/Sec  
Conns_usage Indicates the percentage of connections that were used by this node. Percent  
Max_conns Indicates the maximum number of connections that were established on this node since the start of the traffic manager. Number  
Total_requests Indicates the rate at which the requests were processed by this node. Requests/Sec This measure is a good indicator of the workload on the node.

Comparing the value of this measure across nodes will help you determine whether all the requests have been processed or not. Request processing bottlenecks if any, can thus be isolated and resolved.