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  • erikklaassen
    Junior Member
    • Sep 2007
    • 13
    #1

    missing (graph) data

    Hi,

    I have a zabbix server witch is monitoring 35 switches, a total of 1300 items. We monitor al our switches with snmp and take samples once every 5 min.

    On interfaces that have more than 100mbit/sec the graphs starting to show gaps. It is actually not a graph problem because the latest data is also showing no data:

    H_swithX: Port 169 GigabitEthernet3/2 OutOctets

    2011-10-26 12:28:08 1319624888 92293392
    2011-10-26 12:03:08 1319623388 101673328
    2011-10-26 11:58:08 1319623088 1905976
    2011-10-26 11:53:08 1319622788 2304328
    2011-10-26 11:43:08 1319622188 68140544

    It should have data every 300sec.

    I updated the StartPollers to 50, no luck...
    I checked the queue's most of the time they are empty, sometimes snmpv2 shows ~30 items in the 5 sec queue.

    The zabbixserver(1.8.6) is a VM on a XenServer, using 2 core's and 4gb memory.
    Last edited by erikklaassen; 01-11-2011, 11:04.
    Tags: None
    • jobster
      Junior Member
      • Sep 2008
      • 4
      #2
      i have a similar setup, with the same problem, this most often seen on our 10GE uplinks and on etherchannels where there is more traffic

      Number of hosts (monitored/not monitored/templates) 652 605 / 9 / 38
      Number of items (monitored/disabled/not supported) 201948 161320 / 39495 / 1133
      Number of triggers (enabled/disabled)[problem/unknown/ok] 2295 1764 / 531 [2 / 117 / 1645]
      Number of users (online) 14 2
      Required server performance, new values per second 302.64 -

        Comment

        • erikklaassen
          Junior Member
          • Sep 2007
          • 13
          #3
          Yes it seem only on the interfaces that handle more than 100Mbit/sec. I checked other interfaces during the same period of time and they are not missing any data.
          When the traffic on the 1Ge interface drops from 150Mb/sec to about 50 the data is collected fine.

          Has i something to do with the large number of octets and the custom multiplier? I collect the octets and multiply them by 8 and store them as delta speed per second.

            Comment

            • erikklaassen
              Junior Member
              • Sep 2007
              • 13
              #4
              Found it!

              Consider SNMP Counters: Frequently Asked Questions
              http://www.cisco.com/en/US/tech/tk648/tk362/technologies_q_and_a_item09186a00800b69ac.shtml
              This document describes answers to commonly asked questions about SNMP counters as they relate to Cisco equipment.


              It seems when speed goes over 100Mb/s the octect counters wrap faster than 300 second. I think Zabbix cant calculate this anymore when counters wrap to fast

              We have to use Highspeed Counters like IfHCinOctets. I will test this and report tomorrow

                Comment

                • erikklaassen
                  Junior Member
                  • Sep 2007
                  • 13
                  #5
                  Using the high speed counters did indeed do the trick:

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