We have updated our server from Debian Wheezy to Jessie and from php5.6 to php7.0, but now we have a disk I/O and load average peak exactly every hour. The exact time depends on the system start time.

On this server, we have:

  • nginx/1.10.1
  • PHP 7.0.8-1~dotdeb+8.1
  • Percona mysql server 5.6.30-76.3-log
  • dovecot 2.2.devel
  • postfix 2.11.3-1
  • java 1.7.0_101

We have tried to return to php5.6, disable cron, disable postfix and dovecot, stop our Java app, but nothing helped.

The peaks look like the following: enter image description here

The iotop looks like the following: enter image description here

How can I know exactly what causes these peaks and eliminate them?


The problem was https://developers.google.com/speed/pagespeed/module/ which have done cache clean every hour.

Configuration it to store files on tmpfs fixed the problem.

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