What may be causing IO spikes?
I have a 720 linode which at regular period spikes on CPU usage and IO usage (but not network traffic). How do I know which process is causing such spike? The spike is semi-regular (though not perfectly predictable) though I do get one such spike per day.
I am attaching the sceenshot of one such spike here
I have a daily backup process which runs once daily. But the timing of the spike doesn't match exactly with it. What could be causing such a spike? Any clue.
You can test by simply disabling log rotation for a few days.
So far, disabling the logrotate cron temporarily fixed the problem - now to track down what is actually happening.
So I tried running logrotate - /usr/sbin/logrotate -f /etc/logrotate.conf and it finished very quickly… as in < 2 seconds. Now I'm confused…
So I've installed Munin along with the multimemory plugin and re-enabled the logrotate cron. I guess I'll have to wait and see tomorrow…
Did you solve your problem ? I'm having the same problems with random IO spikes, or CPU spikes.