Ns TCP Test
This test monitors TCP connections and retransmissions handled by the NetScaler appliance.
Target of the test : A Citrix NetScaler Appliance
Agent deploying the test : An external agent
Outputs of the test : One set of results for every Citrix NetScaler being monitored
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Measurement | Description | Measurement Unit | Interpretation |
---|---|---|---|
Server connections |
Indicates the number of server connections in the NetScaler device. |
Number |
|
Client connections |
Indicates the number of client connections in the NetScaler device. |
Number |
|
Connections serving requests |
Indicates the number of connections to the NetScaler device that are currently serving requests. |
Number |
This metric is a key indicator of the workload handled by the NetScaler device. |
Server connections in established state |
Indicates the number of server connections in NetScaler in established state. |
Number |
|
Client connections in established state |
Indicates the number of client connections in NetScaler in established state. |
Number |
|
Spare connections |
Indicates the number of spare connections ready to be used. |
Number |
|
Surge queue length |
Indicates number of number of connections in surge queue. |
Number |
The NetScaler device can be used to limit the number of simultaneous requests that are passed on to a server. When a request is completed, additional requests are forwarded to the server. If a request arrives and the server is handling the maximum configured number of requests, the NetScaler device places the new request in a surge queue, where the request waits for its turn to be sent to the server for processing. The surge queue allows a server to run at peak capacity without the risk of having it spiral out of control because of a surge of incoming requests. The surge queue length indicates whether a server is able to keep up with its incoming workload or not. If the surge queue is consistently greater than 0, this indicates that the server is not able to keep up with the workload and additional server capacity is required. On the other hand, a periodic surge is not a cause for concern. |
Server connections opened |
Indicates the total number of opened server connections. |
Number |
|
Client connections opened |
Indicates the total number of opened client connections. |
Number |
|
Data traffic received |
Indicates the TCP traffic received during the last measurement period. |
MB/Sec |
|
Data transmit rate |
Indicates the TCP traffic transmitted during the last measurement period. |
MB/Sec |
|
Connection establishment timeouts |
Indicates the number of times connection establishment timed out during the last measurement period. |
Number |
|
Connection retries |
Indicates the number of times TCP connection established was retried during the last measurement period. |
Number |
|
Client retransmissions |
Indicates the number of retransmissions from clients during the last measurement period. |
Number |
Ideally, the number of retransmissions should be a small fraction (< 5%) of the total number of transmissions. |
Server retransmissions |
Indicates the number of retransmissions from servers during the last measurement period. |
Number |
Ideally, the number of retransmissions should be a small fraction (< 5%) of the total number of transmissions. |
Retransmits sent |
Indicates the number of retransmissions sent during the last measurement period. |
Number |
|
TCP retransmission failures |
Indicates the number of retransmission failures during the last measurement period. |
Number |
|