High i/o by jbd2/md2-8 every day same hour

Discussion in 'Kernel Questions' started by servidoresadmin.com, Sep 14, 2015.

  1. Hello,
    We have about three servers whith same issue:

    Every day at same hour (about 10:27) have high i/o. We install iotop and see that jbd2/md2-8 is getting high i/o on ssd disk and get about 2-3 of cpu.

    The issue is with mysql slaves that get a lag every day at same hour...
    We study it and we are sure is not an external cron or high traffic....

    Any kernel parameter can control it? Any idea?


    Administración de servidores
  2. Hello,

    Can you please install atop command on your server and monitor your server with atop -d command, If mysql is increasing disk IO on your server then try to check which mysql databases is responsible for that. You can check that with mysqladmin -proc command

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