Causes of slow performance:
Out of tune. See Section 18.11, “Performance Tuning”.
Network load or packet loss may be too high.
In very rare cases, network cables or switch equipment may be defective.
Verify that network connections are 100F.
Use utcapture to assess network latency and packet loss.
As latency and packet loss increase, performance suffers.
The utcapture utility connects to the Sun Ray
Authentication Manager and reports packet loss statistics and
round-trip latency timings for each client connected to this
server. See the utcapture man page to learn
more about this command.
Table 18.7, “utcapture Output” describes the information that utcapture outputs.
Table 18.7. utcapture Output
Data Element | Description |
|---|---|
TERMINALID | The MAC address of the client. |
TIMESTAMP | The time the loss occurred in year-month-day-hour-minute-second format, for example, 20041229112512. |
TOTAL PACKET | Total number of packets sent from the server to the client. |
TOTAL LOSS | Total number of packets reported as lost by the client. |
BYTES SENT | Total number of bytes sent from the server to the client. |
PERCENT LOSS | Percentage of packets lost between the current and previous polling interval. |
LATENCY | Time in milliseconds for a round trip from the client to the server. |
The following command captures data every 15 seconds from the Authentication Manager running on the local host and then writes it to stdout if any change occurs in packet loss for a client.
% utcapture -h |
The following command captures data every 15 seconds from the Authentication Manager running on the local host and then writes it to stdout.
% utcapture -r > raw.out
The following command captures data every 15 seconds from the
Authentication Manager running on server5118.eng and then writes
the output to stdout if any change occurs in packet loss for the
client with ID 080020a893cb or
080020b34231.
% utcapture -s sunray_server5118.eng 080020a893cb 080020b34231
The following command processes the raw data from the input file
raw-out.txt and then writes to stdout the
data only for those clients that had packet loss.
% utcapture -i raw-out.txt
The utquery command interrogates a client and
displays the client's initialization parameters with the IP
addresses of the DHCP services that supplied those parameters.
This command can be helpful in determining whether a client was
able to obtain the parameters that were expected in a particular
deployment and in determining specific DHCP servers that
contributed to the clients initialization. See the
utquery man page to learn more about this
command.