Forum Discussion

antonio_128583's avatar
antonio_128583
Icon for Nimbostratus rankNimbostratus
Feb 12, 2014

Service unavailable when analytics is enabled

Dears's

 

I already deployed F5 Big IP LTM 1600 at a client premises to load balance traffic between 2 HTTP servers running the apache tomacat services on a Linux platform. Everything is running properly until i activate the analytics service (adding the virtual server), at this moment all the clients faces a huge slowness and can’t connect to their application. The F5 version is 11.2 with SNAT enables, no SSL or compression are activated on this hardware.

 

Note that the CPU is 10% and the RAM is 50% when the analytics service is activated, the hardware normal throughput is 4 MB a peak hours. (Reference Dashboard).

 

I need to know why the service is degraded whenever analytics is active.

 

Regards; Antonio

 

application delivery
citrix
ihealth
management
performance
TMSH
  • Cory_50405's avatar
    Cory_50405
    Icon for Noctilucent rankNoctilucent
    Feb 12, 2014

    What are your resource provisioning levels set to? Check this in System -> Resource Provisioning

     

  • antonio_128583's avatar
    antonio_128583
    Icon for Nimbostratus rankNimbostratus
    Feb 12, 2014

    Hello,

     

    It is set to minimum, i check many references were they advise to be nominal but i'm not sure that this will resolve the problem. As changing AVR resource provisioning level requires a reload and this need to be scheduled in a maintance window.

     

    do you think it is the root cause of this degradation?

     

    Regards; Antonio

     

  • Cory_50405's avatar
    Cory_50405
    Icon for Noctilucent rankNoctilucent
    Feb 12, 2014

    With a CPU utilization of 10% and RAM at 50%, your clients shouldn't be experiencing issues connecting to applications. What kind of statistics are you gathering in the analytics profile?

     

  • antonio_128583's avatar
    antonio_128583
    Icon for Nimbostratus rankNimbostratus
    Feb 12, 2014

     

    Attached is a capture of the configuration of the analytics profile, this configuration consisting of 4 pictures hopefully you receive all of them.

     

  • Cory_50405's avatar
    Cory_50405
    Icon for Noctilucent rankNoctilucent
    Feb 12, 2014

    Upgrading the provisioning level for AVR to nominal is a good idea. It shouldn't present any risk to LTM. A minimal provisioning isn't recommended and won't allow for AVR to obtain more resources if needed.

     

    I feel your pain regarding maintenance windows and impacting changes. Our organization does the same thing.

     

  • antonio_128583's avatar
    antonio_128583
    Icon for Nimbostratus rankNimbostratus
    Feb 13, 2014

    Thanks for your prompt feedback, i will be adapting the following action plan: Step 1: Changing the provisionning level of the AVR to nominal, if the problem was not resolved. Step 2: I will empty all the buffer logs, if the problem was not solved. Step 3: Upgrading to version 11.4. i will be sharing the results according to the execution frame with the status of this problem. Any other suggestion??

     

  • MACTEP's avatar
    MACTEP
    Icon for Altocumulus rankAltocumulus
    Dec 04, 2014

    I understand that the topic is old, but someone else might be looking for the same information. In my case enabling analytics profile caused disruption to HTTPS traffic. Confirmed F5 bug.

     

    "PD have identified the LTM 11.5.1 is hitting bug id 464287 - Incorrect rechunking in AVR plugin2. This bug id is fixed in 11.5.1 HF4."

     

    Solution: upgrade to 11.5.1 HF4 of higher.

     

    Workaround: set Response-rechunking setting in http profile to anything except "selective". It is the default setting and it is incompatible with analytics.