On my Debian VPS, I am getting peaks of IO wait, which blocks my server for a few minutes. On the screenshot, you can see the Idle (green) which suddenly drops for IOwait (pink), which eventually blocks even the logging process (white stripe).
There is nothing strange happening on the machine (as you can see, most of the time, the machine is waiting) and the system resources are free (800 MB of RAM is unused).
I am worried that this is actually a problem of my VPS provider, but I don't know how to prove that.
Is there a way to find which can be causing this?
What can be the other small peaks, which are repeating probably every 5 minutes? How can I find how they are caused?