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How Switch Port utilization is calculated in BNA?

  • 1.  How Switch Port utilization is calculated in BNA?

    Posted 08-20-2018 09:30 AM

    Is there any mathematical formula which can explain the logic behind calculating the BNA Switch Port utilization? I would like to confirm if BNA is reporting correct values.

     

    Because the port traffic is very less whereas utilization is showing 100%. How can the utilization is 100% when the port traffic is less?


    #BrocadeManagementSoftwareCommunity


  • 2.  What is calculation or formula for port throughput%28Transfer Rate%29 and Port utilization with example

    Posted 08-20-2018 11:32 PM

    Hi All,

     

    How port throughput and utilization is calculated (formula). Please provide us the example for FC switch port.

     

    Regards,

    Dnyaneshwar


    #BrocadeManagementSoftwareCommunity


  • 3.  Re: What is calculation or formula for port throughput%28Transfer Rate%29 and Port utilization with example

    Posted 08-21-2018 12:04 AM

    @Dnyaneshwar

     

    I moved the thread to Fibre Channel Forum, and notice is another threads with the same/ similarly question posted yesterday.

     

    https://community.brocade.com/t5/Management-Software/How-Switch-Port-utilization-is-calculated-in-BNA/m-p/97350

     

    are you the same user ?


    #BrocadeManagementSoftwareCommunity


  • 4.  Re: What is calculation or formula for port throughput%28Transfer Rate%29 and Port utilization with example

    Posted 08-22-2018 03:25 AM

    Hi Antonio,

     

    Thanks for taking forward this request. Yes, we are from the same organization.

    Let me provide some more details for this request.

    For Port Tx/Rx percent utilization, we have observed formula in "Brocade Monitoring and Alerting Policy Suite Configuration Guide, 8.1.0" on page no. 37 as (traffic/port speed)*100.

     

    But when we have done actual calculations then calculated value comes somewhat different.

    Tx = 204.317 Mb/s
    Port Speed = 8 Gb/s

     

    After calculation Tx Utilization(%) = 2.55

    But on BNA server Tx Utilization(%) has observed as 24.04

     

    Is there any other formula has been used for calculation? If yes, Could you please provide it to us.

     

    Thanks & Regards,

    Bhushan Patil


    #BrocadeManagementSoftwareCommunity


  • 5.  Re: What is calculation or formula for port throughput%28Transfer Rate%29 and Port utilization with example

    Posted 09-19-2018 01:01 AM

    Hi,

     

    Are you sure that TX trafic you picked up is in Mb (bits) and not in MB (bytes) ?

     

    BNA (performance graph ) or portperfshow command diplay value in MB/s.

     

    If it was MB/s, the result of your calculation would be close from what BNA Tx utilization was displaying.

     

    Calculation : [ (8*0.204317) / 8 ] / 100 = 20.4317 %

    BNA server Tx Utilization(%) has observed as 24.04

     

    Regards,

    jms.


    #BrocadeManagementSoftwareCommunity


  • 6.  Is there any mathematical formula which can explain the logic behind calculating the BNA Switch Port

    Posted 08-26-2018 07:48 AM

    Is there any mathematical formula kissanime which can explain the logic groupme behind calculating the BNA Switch Port utilization? I would like to confirm if BNA is reporting correct values. Because the port traffic is very less whereas letgo utilization is showing 100%. How can the utilization is 100% when the port traffic is less?


    #BrocadeManagementSoftwareCommunity


  • 7.  Re: Is there any mathematical formula which can explain the logic behind calculating the BNA Switch Port

    Posted 09-03-2018 09:24 AM

    Shane,

     

    Kindly let me know if you happen to know the calculation of port utilization in BNA.


    #BrocadeManagementSoftwareCommunity