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3am High Load spike

Discussion in 'General Discussion' started by Cameron W, Dec 28, 2016.

  1. Cameron W

    Cameron W Registered

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    Hi Guys,

    I got a strange issue going on and cannot figure out what's going on. Every morning at around 3:50am give or take 5 minutes which is waking me up every morning.

    I checked the cron job logs and nothing is scheduled to run around the time except our ticket retrieval cronjob which is run every 2 minutes for our ticket support system.

    My monitoring charts is showing me a big spike in the VM Swap, it rises sharply and falls sharply after 2 - 3 minutes then the rest of the day, the server is perfect. I get no high process emails and it is only happening at this time.

    We have r1soft backing up but usually this is finished by 2:30am. I checked also crontab -e and confirm that no tasks are running around this time.

    Code:
    Current Memory:
    Mem:       10GB 
    Swap:      12GB
    
    Virtualization: kvm
    Operating System: CloudLinux 7.3 (Yury Malyshev)
     Kernel: Linux 3.10.0-427.18.2.lve1.4.24.el7.x86_64
     Architecture: x86-64
    
    CPU:
     Intel(R) Xeon(R) CPU E5-2697 v3 @ 2.60GHz (4 Core)
     
  2. cPanelMichael

    cPanelMichael Forums Analyst
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  3. Bazinga

    Bazinga Active Member

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    hard to say what is the core of the issue, it should be checked right on a server with some tools like 'iotop' etc. Also, please check cache/slab memory usage in time when issue is happening, e.g.:
    egrep -i 'slab|cache' /proc/meminfo
     
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