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Occasional Contributor
Posts: 13
Registered: ‎06-16-2014

bottleneckmon not showing congestion bottlenecks

[ Edited ]

Hello,

I have the following bottleneckmon settings on a switch:

"bottleneckmon --status" output:

 

Bottleneck detection - Enabled
==============================

Switch-wide sub-second latency bottleneck criterion:
====================================================
Time threshold                 - 0.500
Severity threshold             - 50.000

Switch-wide alerting parameters:
================================
Alerts                         - Yes
Latency threshold for alert    - 0.100
Congestion threshold for alert - 0.500
Averaging time for alert       - 60 seconds
Quiet time for alert           - 60 seconds


But the bottleneck monitoring doesn't seem to work.


We had an issue when an SVC was maxing out the 8G bandwidth for several hours.
When I check a historical performance graph for the relevant port in BNA, it shows that the port was doing 780 MB/sec (rx) for many hours non-stop.


I'm wondering why we did not receive any bottleneckmon alerts from this.

If I check directly on the switch with errdump, I also don't see a single congestion bottleneck warning.

 

Also, when I issued "bottleneckmon --show" at the time that the problem existed,

it was just showing "number of bottlenecked ports: 0",

this while "portperfshow -tx -rx" for the relevant port was constantly showing an RX rate of more than 700 MB/s.

 

I wonder why bottleneckmon is silent.
Any idea what I am missing here?
(switch firmware level is 7.3.1a)

Frequent Contributor
Posts: 80
Registered: ‎01-28-2010

Re: bottleneckmon not showing congestion bottlenecks

where do you want to see those alerts?

 snmp?

or over

BNA?

 

maybe check snmp settings? if you use snmp to forward the alerts to a common system where you collect everything, besides bna

 

or you invest some time and read yourself into MAPS

 

http://www.brocade.com/content/html/en/administration-guide/fos-741-maps/index.html

 

in maps there is nomore bottleneckmon instead you use maps policies to monitor the port performance attributes

 

beware of port fencing and port decoomision in MAPS

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