I have apache2 running on a server.
Today there were a lot of http requests (but not unusual) and somehow the load average went up to over 200(!!!). Obviously the website was down (not reachable).
Stopping apache would lead to a relatively quick drop in load but as soon as I started it again the load went over 100 within seconds.
What's weird is that the CPU and MEM workload were normal or even low as if the system did not "realize" there were a lot of processes to handle.
From there on the load went back to normal (<1) within minutes and the website was suddenly reachable again.
I really cannot explain myself this kind of behaviour. Can anyone help me prevent it in the future?