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Graphing TCP Retransmits
The TCP Retransmits graph indicates whether or not data is being transmitted over a network. Using TCP, information is transmitted in pieces called packets . A packet consists of:
A header
Contains transmission information, such as the IP addresses of the sender and receiver, the protocol that is being used, and the packet number.
A payload
Contains the data that is being sent.
A trailer
Contains data that denotes the end of the packet, as well as error correction information.
TCP retransmits indicate that certain network services may not be completing properly because of a high load on a network or a system. A lost packet can indicate network congestion, and requires the sender to reduce the transmission rate and to retransmit the packet. A slower transmission rate combined with retransmitted packets reduces network performance.
Generating a TCP Retransmits Graph
To generate a TCP retransmits graph, do the following:
- On the Global Scan dashboard or My Infrastructure panel, click the name of the system whose information you want to graph.
- In the tree panel, click the Graphing tab.
- Click TCP Retransmits .
- Select the start and end dates and times for which the graph will chart data. For more information, see Understanding Dates and Times
- Click Generate Graph .
Graphing User Activity
up.time uses the following graphs to chart the activity of users on a Linux or UNIX system:
Login History
The number of times or frequency at which a user has logged into a system during any 30 minute time interval.
Sessions
The number of sessions or number of distinct users who are logged into a system during any 30 minute time interval.
Using these graphs, an administrator can identify user load and whether or not there is any correlation between user logins or number of sessions and problems with the performance of the system. These graphs use the same input criteria, but they return different data.
Generating a User Activity Graph
To generate a user activity graph, do the following:
- On the Global Scan dashboard or My Infrastructure panel, click the name of the system whose information you want to graph.
- In the tree panel, click the Graphing tab.
- Click either Login History or Sessions .
- Select the start and end dates and times for which the graph will chart data. For more information, see Understanding Dates and Times
- Click Generate Graph .
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