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Muhammad_Irfan1's avatar
Muhammad_Irfan1
Icon for Cirrus rankCirrus
Dec 16, 2014

Busiest CPU jumps to 100% usage

F5 LTM memory usage id 18.1% and busiest CPU remains between 6 to 13 %. But yesterday and today again I noticed a spike in busiest CPU and busiest cpu rises to 100% while average cpu was 17 at tha...
shaggy's avatar
shaggy
Icon for Nimbostratus rankNimbostratus
Dec 18, 2014

is it happening while you do something on the f5? are you creating UCS backups when the CPU spikes?

 

  • Muhammad_Irfan1's avatar
    Muhammad_Irfan1
    Icon for Cirrus rankCirrus
    Dec 19, 2014
    No I am not taking UCS backup which busiest cpu spikes. And whenever it spikes it spikes to 100% otherwise it doesn't spike. It does not happen very often. Average at the time of spike is 18%. Could this be the CMP disable at one VS out of my two VS.
  • Muhammad_Irfan1's avatar
    Muhammad_Irfan1
    Icon for Cirrus rankCirrus
    Dec 19, 2014
    During creating QKVIEW file I experienced the busiest cpu to 90 and average 20%. Why cpu is not equally divided? But get these spikes during times when I am not making backup.
  • shaggy's avatar
    shaggy
    Icon for Nimbostratus rankNimbostratus
    Dec 19, 2014
    SOL15710: Large BIG-IP files may cause the csyncd service to spike CPU utilization - https://support.f5.com/kb/en-us/solutions/public/15000/700/sol15710.html disabled CMP could cause a single CPU to spike if something happened to that virtual server - for example, if an irule is applied and one request caused something to go awry, or if that virtual server suddenly had a high number of connections. You should open a support case.
  • Muhammad_Irfan1's avatar
    Muhammad_Irfan1
    Icon for Cirrus rankCirrus
    Dec 19, 2014
    Yes I have proxypass iRule applied to that VS on which I have disable CMP. I am thinking of enabling it back