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traveler_94007's avatar
traveler_94007
Icon for Nimbostratus rankNimbostratus
Jul 09, 2012

CPU intensive in LTM v11

Hi all,

 

 

We are having an issue with two loadbalancer in Active/standby mode. A couple of times (randomly )we have experienced in one of them cpu loads that arrive to the 97% of the system, when trying to access via https to the LTM (making impossible to access to it)

 

 

Platform: BIG-IP 3600

 

Version: BIG-IP 11.1.0 Build 1943.0 Final

 

 

When having the issue we checked that 3 processes consumes most ot the available cpu: fpdd, ksoftirqd/1 and ksoftirqd/cpu with 39,7%, 31,9 and 29,8 aprox.

 

 

From the httpd logs we can only see the attemps to log:

 

 

 

Jul 9 17:01:43 hostname_lb err httpd[27996]: [error] [client x.x.x.x] proxy: error processing end, referer: https://1.1.1.1/tmui/login.jsp

 

Jul 9 17:01:43 hostname_lb err httpd[5187]: [error] [client x.x.x.x] proxy: error processing end, referer: https://1.1.1.1/tmui/login.jsp

 

Jul 9 17:01:43 hostname_lb err httpd[5184]: [error] [client x.x.x.x] proxy: error processing end, referer: https://1.1.1.1/tmui/login.jsp

 

 

 

And the ltm logs it is seems the device is unable to monitor any check because the high cpu:

 

 

Jul 9 17:01:49 hostname_lb notice mcpd[4719]: 01070638:5: Pool /Common/pool_CHK_s_EE20LTP_WDSL_Internal member /Common/node_2.2.2.158:8103 monitor status unchecked. [ w as node down for 0hr:0min:6sec ] Jul 9 17:01:49 hostname_lb notice mcpd[4719]: 01070638:5: Pool /Common/pool_CHK_s_EE20LTP_WDSL_Internal member /Common/node_2.2.2.161:8103 monitor status unchecked. [ w as node down for 0hr:0min:6sec ]

 

 

Any help/advice for the troubleshooting would be appreciated

 

 

Thanks.

 

 

Regards

 

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  • Laudec_55181's avatar
    Laudec_55181
    Icon for Altostratus rankAltostratus
    Jul 09, 2012
    I might recommend that you perhaps install and use HF4. There has been some bugs that was fixed, that could be causing the random CPU spikes. This might be a quick and easy way to fix it, without going into to much troubleshooting, to try and find the issue (that is, of course, if it is something that is fixed by the Hotfix)

     

     

    Install the HF on the standby device first, failover, and see if it resolves the issue. Then do the standby device.
  • traveler_94007's avatar
    traveler_94007
    Icon for Nimbostratus rankNimbostratus
    Jul 09, 2012
    Thanks a lot Lauder.

     

     

    I have a look at the HT and we wil consider to install them.