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FaustoCarramate's avatar
FaustoCarramate
Icon for Nimbostratus rankNimbostratus
May 28, 2015

performance monitoring and network statistics

Hello,

 

We have configured SNMP on LTM Device version 11.5 to monitor the number os connections.

 

On Configuration Utility we see “New connections/sec” = 30 always.

 

But on our SNMP Server it reports only 18-20 always. The PI we have configured on SNMP are: * sysTmmStatServerMaxConns

 

  • sysTmmStatClientMaxConns

     

  • sysTmmStatServerTotConns

     

  • sysTmmStatClientTotConns

     

  • sysTmmStatServerCurConns

     

  • sysTmmStatClientCurConns

     

Also we have some questions regarding these PIs.

 

  • Are they a sum of all connections from all Virtual Servers?

     

  • We see the number of TotConns it is more than 10 times greater than MaxConns.

     

Our main goal is to have network performance statistics. Feel free to suggest other approaches.

 

Thank you in advance. br, Fausto

 

application delivery
LTM
management
performance
TMOS
TMSH

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  • Jessed12345's avatar
    Jessed12345
    Icon for Employee rankEmployee
    May 28, 2015

    TotConns is the total number of connections that have been handled, while MaxConns is the highest number of connections that had ever been handled at one time.

     

    For the purpose of monitoring connection rate you want to use TotConn. The connection rate is the difference between the current TotConn and previous TotConn divided by the number of seconds between the two samples.

     

    For example, if I'm collecting SNMP statistics every 60 seconds, my connection rate would be as follows. TotConn1 = the value of TotConn in the previous polling period TotConn2 = the value of TotConn in the current polling period

     

    (TotConn2 - TotConn1) / 60

     

    So if: TotConn1 = 4000 TotConn2 = 6000 there have been 2,000 new connections over the last 60 seconds

     

    Connection rate = (6000 - 4000) / 60 == 33.3 (33.3 CPS over the last minute)

     

    Finally, when calculating LTM performance statistics be sure that you calculate client-side and server-side statistics separately. Don't add the client-side and server-side TotConn values. Instead, generate separate client-side and server-side statistics.

     

    Hope this helps, --jesse