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562 Fabric OS Administrator’s Guide
53-1002920-02
Top Talker monitors
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2011-03-21 00:59:55
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Clearing frame monitor counters
1. Connect to the switch and log in using an account with admin permissions.
2. Enter the fmMonitor
--clear command to clear the counters on the ports on which the
specified frame type is monitored.
Example
The following example clears the counters for the ABTS monitor from ports 7 through 10.
switch:admin> fmmonitor --clear ABTS -port 7-10
Top Talker monitors
Top Talker monitors determine the flows (SID and DID pairs) that are the major users of bandwidth
(after initial stabilization). Top Talker monitors measure bandwidth usage data in real time and
relative to the port on which the monitor is installed.
NOTE
Initial stabilization is the time taken by a flow to reach the maximum bandwidth. This time varies
depending on the number of flows in the fabric and other factors. This time can be up to 14 seconds
in the Backbones, and up to 82 seconds in the fixed-port switches.
Applications can use Top Talker monitors data to do the following:
• Re-route the traffic through different ports that are less busy, so as not to overload a given
port.
• Alert you to the major users of bandwidth (top talking flows) on a port if the total traffic on the
port exceeds the acceptable bandwidth consumption.
You can use Top Talker monitors to identify the SID and DID pairs that consume the most
bandwidth and can then configure them with certain Quality of Service (QoS) attributes so they get
proper priority. Refer to Chapter 14, “Optimizing Fabric Behavior,” for information on QoS.
The Top Talker monitors are based on SID and DID pairs and not WWNs. Once Top Talker monitors
are installed on a switch or port, they remains installed across power cycles.
Top Talker monitors support two modes, port mode and fabric mode:
• Port mode Top Talker monitor
A Top Talker monitor can be installed on a port to measure the traffic originating from the port
and flowing to different destinations.