08-20-2018 09:29 AM - edited 08-20-2018 10:02 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?
08-20-2018 11:32 PM
How port throughput and utilization is calculated (formula). Please provide us the example for FC switch port.
08-21-2018 12:04 AM
I moved the thread to Fibre Channel Forum, and notice is another threads with the same/ similarly question posted yesterday.
are you the same user ?
08-22-2018 03:24 AM
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,
08-26-2018 07:47 AM - edited 08-27-2018 11:13 PM
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?
09-03-2018 09:24 AM
Kindly let me know if you happen to know the calculation of port utilization in BNA.
09-19-2018 01:00 AM - edited 09-19-2018 01:34 AM
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
09-26-2018 03:17 AM
I dont know very much about BNA calculation process. But I know about How to managed and calculate SAN port count using the following rules:
• Only switches discovered from the SAN tab are counted.
• The switch port must be licensed.
• The ports must belong to a currently monitored fabric.
• ICL ports are not counted.
• The port must be a physical port (for example, VE_Ports are not counted on the 4 Gbps router
extension switch; however, the gigabit ports are counted).
• Access Gateway ports are counted.
• The ports from discovered Virtual Fabrics are counted.
• The ports from managed Fabric OS switches are counted.
• The ports from unmanaged, unreachable, and missing switches are not counted.