Dell POWEREDGE M1000E - Manual (Page 108)

80 Fabric OS Command Reference
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bottleneckMon
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severity on the switch. You can filter the output to display only latency or congestion bottleneck statistics.
When used without port operand the command displays the number of ports affected by bottleneck
conditions. A "bottlenecked" port in this output is defined as any port that was affected by a bottleneck for
one second or more in the corresponding interval.
When using the --show command, you may see a "no data for x seconds" or "no data" message
displayed at the end of a line of output. The "no data..." message in any interval means that there was no
data to analyze for the stated number of seconds or for the entire interval if the remark is simply "no
data." This typically means that there was no traffic on the link for the stated number of seconds. The
percentage of affected seconds displayed takes this into account. For example, if there was no traffic for
6 seconds in an interval of 10 seconds, and 1 second out of the other 4 seconds was affected by a
bottleneck, the display for that interval would show 25% as the percentage of affected seconds (1 out of
4), and state "no data for 6 seconds." However, if there is no traffic because the port is offline, the "no
data..." message is displayed.
The --status option displays bottleneck configuration details for the current (logical) switch. If virtual
fabrics are enabled, ports not belonging to the current logical switch are not displayed. The command
output includes the following information:
Bottleneck detection
Enabled or disabled
Switch-wide sub-second latency bottleneck criterion
Displays the following parameters:
Time threshold
The value set with the -lsubsectimethresh operand.
Severity threshold
The value set with the -lsubsecsevthresh operand.
Switch-wide alerting parameters
Displays the following parameters:
Alerts?
Yes (enabled), No (disabled), Congestion only, or Latency only.
Congestion threshold for alert
The severity threshold for triggering a congestion alert. This threshold indicates
the percentage of one-second intervals affected by congestion conditions within a
specified time window. The congestion threshold is expressed as a fraction
between 0 and 1.
Latency threshold for alert
The severity threshold for triggering a latency alert. This threshold indicates the
percentage of one-second intervals affected by latency conditions within a
specified time window. The latency threshold is expressed as a fraction between 0
and 1.
Averaging time for alert
The time window in seconds over which the percentage of seconds affected by
bottleneck conditions is computed and compared with the threshold.
Quiet time for alert
The minimum number of seconds between consecutive alerts. The value
assigned to this parameter applies to both latency and congestion detection.
Per-port overrides for sub-second latency bottleneck criterion
Custom configuration for the above mentioned sub-second latency bottleneck
parameters. Note that everything above this line applies to all ports in the switch
that don't have any custom configuration or exclusions.