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Slow server performance without apparent reason

Discussion in 'Workarounds and Optimization' started by cristian muresan, Apr 10, 2019.

  1. cristian muresan

    cristian muresan Registered

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    We've been dealing with an issue for about 2 weeks that we're out of ideas of how to deal with moving forward.

    Server setup and Application:
    Google Cloud Instance, with WHM/cPanel
    WordPress 5.0+
    PHP 7.0
    Apache 2.4

    Problem:
    1-5 times during the day, the server (and the website) stops responding (timeout). We cannot get the website to load, but the WHM and cPanel backend is also very very slow. The slowness takes up to 5-10 minutes after which things return to normal.

    We can't even login via WHM during this period.

    What we've checked:
    WordPress error log. While we have some errors here, they do not coincide with the times when we have periods of poor performance.

    Server performance - We have 1 website running on a 16CPU 8GB RAM machine that operates at about 8-10% capacity. No spikes in ram or cpu usage during these periods. The server appears to be idling and is definitely not being overused.

    What we've done:
    We've restarted the machine which fixes the issue. When we tried to restart apache or mysql via WHM, it fails if it's being done during this period of poor performance.

    Questions:
    What should we check? Any particular logs or things to look for? Do you need anything else from us re: server configuration, php, apache, mysql, or anything that can point out what the issue may be? Could it be related to PHP, MySQL, Linux, Apache, etc.? We're dead in the water about where to look for potential problems when we have an underutilized server with no apparent issue. Again, slow, unresponsive server-wide symptoms without an apparent trigger.
     
  2. cPanelMichael

    cPanelMichael Technical Support Community Manager Staff Member

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    Hello @cristian muresan,

    Can you open a support ticket so we can take a closer look to see if we notice anything out of the ordinary that could be contributing to the download/poor performance? You can post the ticket number here once it's opened and I'll link this thread to it.

    Thank you.
     
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  3. cristian muresan

    cristian muresan Registered

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  4. cPanelMichael

    cPanelMichael Technical Support Community Manager Staff Member

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    Hello,

    To update, our Technical Analysts were unable to find anything specific to cPanel & WHM causing the performance issues. The advice provided was to consider reaching out to a qualified system administrator for further assistance. A full list of system administration service providers is available on the link below:

    System Administration Services | cPanel Forums

    Thank you.
     
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