4 Replies Latest reply on Jun 30, 2011 5:17 AM by marco74

    Interface polling more frequent

    marco74

      Good morning,

      I tried to poll an interface bandwidth more frequently (60 seconds, with stats collected every 2 mins), but NPM shows the data at 15 mins steps (even if I set the graph to 1 min).

      I suspect performances issue on the engine. Here below some infos, do you have any ideas?

      Thank you.

      Data Base

      Web ServerITNPMPSM01
      Operating SystemWindows Server 2008
      OS Version6.0.6002.131072
      Service PackService Pack 2
        
      Database ServerPSMSOLARDB\NPM
      CatalogNPM_PSM
      Database EngineMicrosoft SQL Server 2008 R2 (RTM) - 10.50.1600.1 (X64)
           Apr  2 2010 15:48:46
           Copyright (c) Microsoft Corporation
           Enterprise Edition (64-bit) on Windows NT 6.1  (Build 7601: Service Pack 1)
      SQL VersionMicrosoft SQL Server 2008 R2 (RTM) - 10.50.1600.1 (X64)       Apr  2 2010 15:48:46       Copyright (c) Microsoft Corporation      Enterprise Edition (64-bit) on Windows NT 6.1  (Build 7601: Service Pack 1) ; Product level : RTM
      Security ModelUsername / Password
      User Namesa
      Connection Timeout20
         
      Network Elements9022
      Nodes1185
      Interfaces7735
      Volumes102
          
      Alerts37
      Events203395
      Pollers17210
      Polling Engines1
           
      Last Database ArchiveUnknown
      Next Scheduled Database Archive16-giu-2011 02.15
      Database Archive Time02.15
            
      Retain Detail Stats7 Days
      Retain Hourly Stats30 Days
      Retain Daily Stats365 Days
      Retain Events

      30 Days

       

      Orion Core Details

      Help
      Server
      Web ServerITNPMPSM01
      Operating SystemWindows Server 2008
      OS Version6.0.6002.131072
      Service PackService Pack 2
      Network Elements
      Total Count9022
      Nodes1185
      Interfaces7735
      Volumes102
      Version Info
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        • Re: Interface polling more frequent
          njoylif

          I think you may need to configure the remote device and set the statistics interval to match NPM.  If the device only rolls up and presents stats every 15 min, this is what you will get.  you can also check the "raw data" if you click on the graph to verify what data the device is returning to you.

          Another thing to consider is the rollup.

            • Re: Interface polling more frequent
              marco74

              Hello Larry,

              the remote device is a Cisco router ... the bandwidth graph should be obtained reading a MIB about byte tx/rx and doing the math. The frequency depends on the engine, it's not driven by Cisco.

              I don't think there is a command on Cisco to set this behaviour and the interface has a load interval of 30 seconds.

               

              Raw datas are usuallly collected every 15 mins, sometimes 20 mins and the max is 35 mins

                • Re: Interface polling more frequent
                  fcaron

                  Hi Marco74,

                  I am not aware of any setting required on the responding side either. As far as I know, MIB refresh on the Cisco side, withing the agent, is close to real-time. If you SNMP poll every 5 secs, you'll have refreshed data every 5 sec.

                  Back to your question, I don't see any other explanation to the fact that you don't see your expected data granularity (2 min), other than a poller overloaded, or close to be.

                  You have 9,000+ elements on this poller, this is pretty much was we consider the maximum  (eventhough we see instances of pollers going above, because this is not an exact science and so many parameters have an influence).

                  Knowing that you try to set some (all?) interface polling at 2 min, I think that this is your problem. It is a typical behavior of a loaded poller, to not honor the required polling frequency, but work on a best effort basis (in this case 15min seems to be the best it can do).

                  All that is without looking at your Diagnostics and I'm not in support. You can open a case for more certainty.

                  Hope this helps.

                  1 of 1 people found this helpful
                    • Re: Interface polling more frequent
                      marco74

                      Yes, it does. I opened a case and the support, they confirmed that the number of elements is too high; we lowered also the poll/sec rate (205 -> 61).

                      I also increased the default polling frequency from 120 sec to 180; unfortunately we got no dramatic changes ... I'll keep you posted